I'm pretty sure most 390 blocks are capable of excepting 428 cranks. This will surely give you a little more torque and a little more power. This will probably be more expensive than most bolt on's, because there's machine work involved( I think you have to bore .060 over in a 390?) Plus you'll have to find yourself a set of 428 rods too. I also agree that headers, particularly tri-y's will help you scavenge low end torque which is what your lookin' for.
There's no replacement for displacement,
Erik
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