The early engines (pre-64) are an earlier design. Parts selection is limited for these engines compared to the newer engines. You'll have a harder time finding parts, and making it run as well as a '64-newer 389/400 for the same cost and trouble. I don't think later cylinder heads or manifolds will fit. Dont even know if the motor mounts are the same.
$400 for a rebuildable 455 is cheap.
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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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