[BruceWilkie]

Originally Posted by 462-6spd

I'm running the Edelbrock E-Street EFI throttle body on their Pontiac Performer RPM manifold, just used a spread bore to square bore adapter plate. No issues.

Thanks, Gary

The thin plate version adapter will work on performer or rpm intake. However, on a stock intake you need a 4 hole square bore to spread bore adapter. Typically an inch or bit less tall.

IF the throttle body has provision for small or large bolt pattern, a thin adapter(@1/8" like the AFB/Holley adapter for Performer or RPM that Edelbrock sells) on a stock intake, would require making clearance and some blending at the throttle bores of the intake.

[Squidward]

I was reading about Fitech Go EFI last night, and theirs is supposed to do spread or squarebore.