413 swap
I had one of these rebuilt to a 426 (.060 over 413). I'd slap the 452 heads on it, change the cam and run a car water pump. Torque monster. For $100, you are out NOTHING. I'd have bought it to before the guy changed his mind.
Yea..I traded this good engine for a 440 that turned out to be pure junk. Guy would not make good on it. He put it in a Dart. I hope that 413 blows to smithereens. He talked me out of that 413 cause he said I'd have to change so much over. Bullsh**. I was younger then and did'nt know any better. Live and learn.
Changing heads and a water pump really isn't that big of a deal.