Possible turbo 318 build

In the near future, I may be building a turbocharged 318 for my 65 dart. I was wondering what it would take to get over 500 horse with about 10-12lbs of boost with a stock headed, hopefully a mild hyd roller cammed motor.

I will definatly go to forged pistons and rods, but what about the crank? I heard that all 273 cranks are steel, but are they a direct bolt in to a 88 roller 318 block?

Thanks, RD