I have a '78 Glastron/Carlson CV23 with a '70 Ford 429/Berk JE that stuck a valve, broke and bent pushrods, spit up a couple of lifters and lost oil pressure. Rebuild plan includes 460 crank, H-Beam rods, flat top pistons, Lunati 276/284 Voodoo cam, Stealth CJ intake. I just sent a check out for a set of Scott Johnson worked D3 heads; 2.25"/1.76" valves, ported to CJ specs, bowls blended and polished, 7/16" studs and guide plates. Looking to make 450-475hp.
The JE will be rebuilt over Winter as well; as far as I know it currently has an A impeller.
Would the bump in power warrant going with an AA impeller? She's used as a pleasure lake boat; some tubing and skiing, and overnighting.