400's have no compression, throw in a big cam and a big carb and you don't have "good street manners" especially if it's an auto. BTDT.

Comparing a high performance, high compression, big cam 396 to a emissions choked, low compression 400 is not useful unless you plan to build the 400 up to similar compression, cam and THEN carb specs then maybe it's relevant.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.