442 w-30 clone headers
 

I'm in the middle of a high performance rebuild and I'm looking at a set of ceramic coated super comp hooker headers for my 1970 cutlass supreme convertible that's cloned as a 442 w-30 and I keep seeing that some headers wont fit cutlass supreme models. Do they hit the transmission cross member or something? What's the deal with them? Which ones should I be purchasing? Thank you!