First things first: If you are a relative newbie, buy a brand new carburetor. It's all right for the old hands to say Thermoquad, but to a newbie the TQ is chancy at best. Part and tuning supplies can be problematic, and the knowledge to tune one is rare. That being said, if you had a TQ guru living next door it would be an excellent choice.

Your first choice should be a Street Demon, 625 cfm. It will bolt onto your stock spreadbore intake. Get the one with the plastic center section. Dunnuck says it is almost perfect out of the box, and I believe him.

You are working under a number of misconceptions.

1. Any carburetor with an adjustable air door or vacuum secondaries can be made to work with your 360. Read my previous post again. Spreadbores especially work for any kind of engine because the small primaries do a lot of the work. An 800 Thermoquad is not too big for your engine. Period. Or a 750cfm Quadrajet, etc.

2. Vacuum secondaries have the same function as a tunable air door so there is no advantage to going that way, except that all vacuum secondary carbs are Holleys, and Holley tuning knowledge and parts are widespread.

3. Quick Fuel Technologies, Barry Grant and Holley are all Holley designed and built carburetors The only new carb you are likely to see that ISN'T built by Holley is the Edelbrock.

A Thermoquad hasn't appeared new on a car or truck for decades. But give Holley (BG) credit for building the Street Demon, a brand new carb that keeps the best qualities of a TQ while being all new and bolting on either squarebore or spreadbore intakes without adapters. It also looks a lot like a carb that is supposed to be sitting on top of a 360.

R.