I'm using stainless turbo manifolds from
GP Headers. They had a single turbo kit for trucks so I figured I'd give it a shot. It actually fits the Chevelle, but on the passenger side the crossover pipe was right on one of the electric fans. So I ordered up some stainless bends from Stainless Bros. and built my own crossover tube. I gained almost two inches of clearance on the fans. For now it's just tacked together, I'll get it welded up later, but nice to have it done.
The first two pics are the original crossover with a stainless flex joint. The last three pics are my new setup, and I decided to use a slip joint instead of the stainless flex joint, seems to be the best way to allow for expansion and movement.