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Get a survey. Not sure what they cost now but it could save you money and pain in the long run.

My '83 Kingfish IO had a drain from the forward bildge in addition to a short drain from the tank area thru the aft bulkhead into the engine compartment. The drain from the tank area had a plug. When I repowered in '07 the yard removed the drain from the tank area and left and inverted "U" in...

In the past I have used acetone and finished off with Marine Penetrol (SP?). Worked well gave the rub rail a nice shine. I'd suggest trying the Penetrol on a small out of the way spot first.

This - I anchor mostly in sand bootom and the fortress 7 works well. Sets well and holds well. YMMV

Always good to narrow problems down before throwing parts at it.

I didn't have the option my pickup was in the drive, and no fresh water connection. Just flush cuffs at the end of the season. A heat exchanger flush would still be a good addition to your maintenance program, you might be surprized at what's in there. Good luck with the new water pump, hope...

I had a 2007 Mecruiser 496 in my old Grady Kingfish and the heat exchanger had removable ends. Perviously it had twin Mercruiser 470s they too had removable ends on their heat exchangers. I made a habit of removing both ends and cleaning the small tubes inside with pressure from fresh water...

I was facing the same decision many years ago with my '25 Kingfish. Opted to repower as I really didn't want to go with a new boat. Another choice suggested was to sell mine and get a newer model used boat but I had owned my boat for a while and knew it's condition and what I had. More...

Reading about the Tiger Cats a few years ago I think there was a change in the hull design at some point. Can't remember what they changed buit IIRC the later ones rode better. At any rate not generic to this threax. Happy you found your boat. Never been on a power catamaran but sailed beach...

Looks Great Grady should make a similar model

I think that will be a tough one. Stringer drive correct? Hope you can find someone, are there still parts out there?

Can't help with your core question but wasn't the Wahoo the inboard powered version of the sailfish. I enjoy seeing the older Gradys being restored. All the best with your project. I recently think I saw a Wahoo project on Marletplace.

Speaking only to the labor cost. I replaced the tank in my old Grady myself on my '83. The tank was accessed through a removable panel in the cockpit deck slightly larger than the tank the tank, easy job. A few years later I was speking to another Grady owner and he was talking costs of...

Call Grady perhaps, what year is the boat?

I recently downsized from my '83 25' Kingfish 254. Purchased used in 1987 and I parted ways with it in late summer this year. Anyway today I was going thru and grinding up old bills etc. While doing so I came accross an owners manual I had requested from Grady after I purchased the boat as there...

Redid my windows several years ago they had everything I needed.

Marine Glass Specialties I believe.

There was a company out of Miami that advertised on this site or used to anyway. They carried the window trim for Grady's. I'll try to find it.

The aluminum trim or the nonmetalic rubber and plastic parts?

As said above not enough info. If seriously thinking about it get a survey and that should give you an idea of the hull condition. The mechanicals would be a crap shoot. Original engine and drive? What make? Parts for I/Os of that era are getting scarce or nonexistent. I repowered my '83...