Waveski, I would use the 1/2" insulator, the wood composite will probably be a better insulator along with the thickness compared to the rubber/steel. You may have to make some slight modifications to linkage, studs/bolts, etc. but it should be minimal. As far as running a Q-Jet, I believe we covered that possibility when you acquired the Edelbrock intake, it is drilled and tapped for a square bore or a spread bore (Quadra-Jet). It was marketed as a direct replacement for the small block spread bore manifold. If and when you install the insulator, triple check that the gaskets and insulator are the same footprint as the carburetor, the bottom surface of the carb probably has some vacuum passages that must be sealed against leaking to the exterior of the mounting surface.
