Maybe a little pricey compared to others, but....
I have a set of 2" SBC headers from Lemons and love them. Most told me it couldn't be done on a Chevy II inside the frame rails. They did it, did it on time, and customer service was what you'd expect for the price.
If I can't get what I need off the shelf, I'll buy from them again.
Steve
'66 Chevy II