340 X Heads in trouble

Thanks for all the advice everyone. I'll be glad to have this engine back together and running. This whole thing has gotten a bit out of hand. I wasn't expecting to have to do so much to a running vehicle when I bought it a couple of months ago. It all started with noticing the excess end play in the crank. Unfortunately I didn't see it when I was first looking the car over. Plus it just sounded too good when it was running to suspect a major problem. I want to think the guy selling it didn't know either. I hope to make a final decision on heads this weekend. There are some good deals out there. How are the Aero head racing products? Thanks again.