273 4 barrel intake manifold, early 64-65 with 5/16 bolts

lemondana said
The holes look drilled out to possibly 7/16 compared to the front AC bracket boss, which is 3/8. You're going to have to use fender washers on those bolts-sorry.

Good observation. I’m not sure really all I can do is ask, if that’s the case is it still a worth while setup to allow me a 4 barrel?