I ran a XE274 in a 400 with 8.8 compression, dished pistons, mild ported 670 heads. Installed 2* advanced. Ran best shifted at 5600 RPM, best time was 13.0 at 104 MPH NA. It ran OK, decent street manners, 10-12" of vacuum. Wanted a lot of timing. It's a lot less seat timing than a RAIV, and less than a RAIII. I think it would be too small in a 455 over 9:1 compression.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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