10 sec street car

ok first unless you are going to run in a "run it like you brung it" class, you first need to decide what class you intend to run in. 10s, oddly enough these days, isnt that hard, but you need to go over the rule book with a fine tooth comb so you know what you need to build, what weight you need to run, etc. to be class legal. C/street hot rod sounds like a nice class for you to run, but remember two things here;

1: weight is the enemy

2: every class has their own weight breaks, IE your car has to weight, with driver, a certain number of lbs per cubic inch of engine displacement. as i recall C/street hot rod was 5lbs per cubic inch. so at 5lbs per ci, with a 427ci engine your car would need to weight in at, with driver, 2135lbs. go to a 408ci engine, and your car only need to weight in at 2040lbs, a weight savings of 95lbs. and that is a huge amount since the power difference between a 427 and a 408 ci engine built the same is very little. weight is just as important as horsepower.

as for running tens, you will need around 500hp to get there, but since you want a streetible car as well, the 408 will serve you better in the long run.

one more thing to decide on what class you are going to run in, and studying the rules carefully, it that some things you might want on the car are illegal in the class.