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You don't need to worry about over carbing with the 850's.

Hotroddave40 got 29.5mpg in his super mileage 318 Cuda with an 850.

Get the "biggie sized" TQ to start with! The TQ will only pull what the engine demands from it.

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The 800 and 850 TQ's have the same size secondary butterflies. The difference is in the primaries.

Me thinks a small motor street motor that sees a lot of around the town driving would want the 800 for the better vacuum signal where it matters for drivability.

Even the small TQ at 800cfm is huge for a stock stroke small block.

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One difference between a Holley and a TQ or Qjet is the AIR VALVES They alter the air flow so you can't over carb with the spring tension set right.

I've ridden in Daves 318 powered Cuda there is no bog with the 850. The primaries are small on the 850's compared to AFB's and Holleys.

1 1/2" on the 850. 1 3/8" on the 800. A BBD for a 318 or super6 has 1 /14".

On my heavy van with a broken air door spring it would lay down and bog. New spring it gets up and honks! Why? The spring regualtes the air flow to engine demand.

Some 360's came with the 850 from the factory.