I took a gamble on a 400 block and lost. It dropped a valve and the piston got smashed pretty good and cracked the cylinder wall. I was hoping to build a 451 or 470 in the 500HP range. Nothing too radical. Providing that the rest of the block checks out okay, do y'all think it would be worth my while to sleeve the bad cylinder and give her a new lease on life? I paid $300 for the engine with a bunch of other crap that I'm hoping to sell off. 400 blocks don't seem to be oozing out of the woodwork around here, so if it's not unfeasible or ridiculously expensive I'd like to salvage this pig. What sayeth the A-body brain-trust?