Re: GXL 302C EGR plate
The squarebore Holley throttle body is a much neater fit, The carbs are MADE for them. There a many spreadbore to squarebore adaptors available to suit the Thermoquad manifold or you could change to a squarebore manifold. Some people recommend a single plane for straight LPG. I used to run a thermoquad throttle body but it needed TWO adaptor plates and a spacer so the secondaries didn't hit the manifold. It was a very tall combo.
1978 XC Fairmont GXL, Emerald green, Jade Int. 351C, 750 VAC, C10, 9" LSD
Air, steer, power windows................