Hi Chevelle292Wagon . . .
I find the articles over at
The Carburetor Shop instructive. They have a nice write up on the differences in
four barrel mounting flanges. As for the Holley 5200 - I believe those were native on Fords. The flange bolt pattern is both wider and longer then a Rochester dual jet:
Holley makes an
Adapter Plate image above.
No experience here beyond way to much time researching on the web . . .
