Stop in for a cup of coffee

Mattax said
basic AFB '57-'74
Bolt pattern 4-¼ x 5 5/8 inch
(includes AFB with shifted throttle bores)

If your making one, then just bolt it on.

Do you still have the broekn adapter?

yeah I still have it. Pic attached

Mattax said
How hard is it to find an AFB?

Isn't that what the Edlebrock's use?

I think the edge rocks use the AVS spreadbore style. I really don’t want to buy a new carb when I have this brand new Holley already.

Reading on the poly Facebook page that some people had to use a Rochester to Holley adapter to get things to line up. Something about bore centers.