EDELBROCK PRO FLO 4

TurboGLH said
You'll probably need 1-1/2" long bolts in every location, with two slightly longer on the throttle bracket holes.

If you're using the bolts that came out of the factory iron intake, some of them will be too short

I order the bolts from edelbrock too and there too long the heads hit the inside of the intake manifold and I cant get them threaded I've even shaved the bolts to make them fit but still no luck