To me it depends on what’s involved in the rebuild of either engine. If you are replacing rods, crank and pistons, it’s far better to start with the 400 block.
If these items are up for replacement, it costs no more to build a 467 stroker from the 400 block and this is a much better solution IMO for a heavy car.
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1964 Catalina 2+2 4sp, 421 Tri-power
1965 GTO, Roadster Shop chassis, 461, Old Faithful cam, KRE heads 305 CFM,
Holley EFI, DIS ignition.
1969 GTO 467, Edelbrock 325 CFM, Terminator EFI
1969 Firebird Convertible
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