Does there exist a 4150 Holley that flows a true 1000 CFM ? And with 1.75" butterflies ?
Maybe I should also specify the 4150 bolt pattern.

Or do you need to go with a Dominator with 2" throttles ?

To my knowledge, a downleg booster "850" has about the biggest combination of venturi and throttle bore,
and I think even those will not reach 900 CFM.

I kind of want to rule out a fuel injection throttle body, just a conventional carb.

Holley sells a 4150 that they call 1000 cfm. And maybe a few people claim a little higher. I wouldn't know how much they really flow.

If you use a 1.45" venturi HP main body along with a 1.75 base plate with slab sided shafts, it will flow over 1000 cfm.

Sure, you can get 1000+ CFM 4150 carbs. The least expensive is probably the QF 1050. I don't think the Holley 1000 is available anymore. BLP makes a bunch of big 4150 main bodies and I'm sure other carb tuners have big options. I've used a QF 1050 for years on the dyno. Really nice carb that makes good power.

Don’t know for sure, but I would suspect the 1.59 venturi 4150 would be real close.

Well here's why I'm asking about actual flow.

Quick Fuel has a Dom with 2" butterflies and 1.71" venturis that they are also calling a "1050".

Same flow as the 4150 "1050" ?

I don't think so.