Bill, this will be my last post regarding your 455 as you aren't listening anyhow.
6X-4 heads, which were low compression 350 heads, are good on a 400. 6X-8 heads, which were low compression 400 heads, are good on a 455.
Buy what you want but don't complain about performance or tuning issues, or how you've been "ripped off", if you don't do your homework and decide on what you are building before you start shopping.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching
