Using a four-barrel on a 273 V8. One source says all of the LA motors will interchange intake manifolds, the other source says, 64-65 V8s had a different angle on the intake manifold bolts, which are unique to those years.
He was answered by Sandy Colter, who wrote: "You are right about the different bolt angle. You can most likely redrill or hog out the bolt holes as they are in the same place different angle. If [the replacement intake manifold is a Edelbrock Torker or 2psp stay away from it. "An LD340 or Edelbrock Performer are OK."
Basiclly, you have a "67" 273. Your safe with the Edelbrock Performer (318-340-360)