Thanks for those articles. I never thought that a 452 head would be good performance head. I've read so much stuff that is negative on the 346 heads that I just assumed the 452 heads were the same with nothing but hardened valve seats. Guess it was a mistake to assume all open chamber heads are junk.

That whole myth with the later engine blocks being thin wall is what I was thinking of. I was just wondering cause I've heard that in the mopar world for quite a while.

This RV has been sitting in the same junkyard for quite a few years with that 440 in it and figured its about time I go and get it. I have the origional numbers matching 383 and 4 speed in my car but I don't want to trash it. Luckily the previous owner threw in an additional b body 4 speed, so I'm gonna put that behind the 440.