Al, 1st time I read your BB Sweptline post, so here's a pic of my 68 D100 (orig matching # 383 2bbl is in storage), with a 70 383 Magnum we just rebuilt. I got ceramic coated Hookers from Summit & they weren't even close to fitting, so Summit gave me nice Headman shorty ceramic headers. They're only 1 3/4" so probably not best for a stroker. I broke in the motor with the headers on, so that dulled the ceramic coating a little. Thick flanges & quality really nice for Headmans. We did have to modify the motor mounts, but that's no problem for you.