Doug Headers & ProComp Speed Master Aluminum Heads

I do. They fit fine. The hole alignment was tight to the head but they went on without modifications. I also installed mine with the engine out (Kevco Pan) of the car with the K-memeber, Starter, and trans installed. I also used Polyurethane biscuit mounts. I will note that Doug's does not send enough Bolts and washers for heads that don't use studs on the ends like stock. If you need 4 more I happen to have some.

If you have a 4 speed check the clearance to the bellhousing, mine had ears at the 3 and 9 o'clock position that interfered (as did my aluminum TKO bell) and you'll need to modify the Z-bar.

Do you have PS? That's an issue with those headers and I can explain more if you do.