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I can't help you with the 390 but the 351w has massive aftermarket support and the block will safely handle 400-750hp depending upon the rotating assembly.. from stock to a forged and balanced aftermarket assembly.
IIRC, the way the block is cast you can't do much in the way of stroking on a 390. It's from the 427/428 engine family (i.e. heads will interchange). It will be a lot heavier, possibly stronger if you have it crossbolted. The only ones I've ever seen are in Mustangs and Fairlanes, etc with an occasional truck.
390 is cool for the uniqueness factor, especially in a '56, but how much you have to spend depends on what you're expecting to do with the truck once it's done.
IIRC, the way the block is cast you can't do much in the way of stroking on a 390. It's from the 427/428 engine family (i.e. heads will interchange). It will be a lot heavier, possibly stronger if you have it crossbolted. The only ones I've ever seen are in Mustangs and Fairlanes, etc with an occasional truck.
390 is cool for the uniqueness factor, especially in a '56, but how much you have to spend depends on what you're expecting to do with the truck once it's done.
I would go with the 351W, but be advised, a 390 with a .030 overbore and an aftermarket stroker goes to 445, and make'em heap big torque and HP.
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