... I think there's a corvette motor in my cuda.

67Dart273 said
I don't know what you mean "the same motor."

The 400 is the same block HEIGHT, so takes the same intake, distributor, etc.

The 400 is a larger bore, so it is "not" a 383

You would be correct in that the 400 pretty much replaced the 383. I think the reason was an attempt to regain some power because of the smog equipment, which made everybody look bad, lack of power, driveability, and mileage.
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That is pretty much what i meant.
Like a 318 and 340 are nearly the same motor"block" but the 340 has a 4" bore where the 318 is around 3 3/4,Same stroke.The 360 has a 4" bore but longer stroke.Also you can basicly bolt all the major parts from a 6.1 on to a 5.7 with a few internal block pieces the 6.1 has for strength.So I use the word motor as meaning block.