I am in need of some exhaust manifolds for a 1983 305 Chevy that I'll be dropping into my '64 C10 this Spring. I will also be putting either an Edelbrock or Holley 600 CFM manual choke carb. on this engine. I was wondering if Rams Horns would fit on this and if I can use any casting numbers or if I have to go w/ a specific casting numbers? (I am looking at a 2" set vs a 2 1/2"...I don't think I'll need the extra umph the 2 1/2 would supply.) Thanks, JD