Lt4
I think the LT1 can handle close to 500 hp. I know the crank and piston rods are rated for 500 hp. You can buy an LT4 kit that comes with cam, head, and intake for about$2500. It is said to put out about 425 hp. Thought about going that way myself, but I also have a 383 that is ready to go with about the same hp.
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Troye 
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