Carburetor Question - Is this a good call?

THE CARBURETOR SHOP / Four barrel mounting flanges
If I understand correctly:
Basic AFB '57-'74 bolt pattern 4¼ x 5 5/8 inch
(includes AFBs with ¼" wider throttle bore centerlines)

Holley pattern is 5 1/8 x 5 5/8 inch
also used on some AVS, and some AFBs.

Spread bore pattern is 4¼ x 5 5/8 inch (same as most AFB)

Early squarebore, mostly 1952-58 except trucks. 3¾ x 3 7/8 inch