If you like speed the Merc drive is a good choice (volvos usually top out around the mid 60's mph). the transom should be 2 pieces of 3/4" plywood thick with a layer of glass between the layers of ply. if you do replace the wood cut the bottom of it short so it doesn't cover the drain plug hole. thats the #1 spot for water intrusion.
are you sure yours is a tripple hatch? I didn't think they made them in the 70's. Got any pictures?
Edit... Well, if it's a Barrel back I think it's a mid 60's boat.
Last edited by BlownCrewCab; 07-21-2010 at 09:28 AM.
Reason: re-read his post....
WTF, Over.....WTF, 10-4.....