I have also had 950 & 1050 3 barrel Hooleys, although I never tried them on a street car, just my 428 FE Fairmont, back when it had a C6 with a transbrake. Performance wise, it ran as fast as any other big Holley that I tried, but in pit/staging lane drivability was not as crisp or smooth, but was not really a concern on a drag car. As mentioned, finding a carb kit, spare pieces and a secondary diaphragm can be problematic. If you already have a 3 barrel in your possesion, and a kit, I would give it a try, but personally, I would not go out of my way looking for one. I have never seen a 3 barrel with annular boosters, all the 3 barrels that I have seen either had regular downleg boosters (950 version), or in the case of the 1050, simply 2 angled brass tubes on the secondary side. Also, with that large oval secondary throttle plate, and no support in the center, I have to wonder if a good backfire could bend the secondary throttle shaft.