I’ve been looking around these forums for some info but haven’t found much, maybe I’m doing it wrong but, I have a 69 bird that came with a 400 but now has a 69 350. Tomorrow I am going to look at a “untouched” 74 455 for $750, I’ll read on the plugs and do a look over and hopefully buy it. To me it’s a good deal but am somewhat concerned how cheap it is. Has anyone swapped a 455 into a 69 bird? If so what issues did you run into? From what I’ve read, all Pontiac blocks, big and small blocks, use the same mounts?

I’ll be using my current Muncie with the 455.

If I get the 455 in and all is good, what could I sell my 69 350 for? I do know the rear main seal is going out and I have the small chamber 47 heads.