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My Mk3 had a 306 with AFR 165 heads, RPM Air Gap intake, MSD distributor and box, COMP Cams 35-440-8 Magnum hydraulic roller camshaft (similar to yours but a little less lift) and it ran fantastic on a Quick Fuel SS-650 carb. I don't own it now, but the new owner reports it's still running great. I do not think the SS-650 is too big for your engine. Like all carbs, it needs to be tuned. But should be a good match for your engine.
I have the -AN (annular ring) version on my Mk4 #7750. Wayne Pressley recommends them. First I've heard it reduces the cfm. Real happy with that one too. That engine is a DART 347 with bigger heads and a little more cam. I have the 750 version on that engine. Probably a little big. But it's wideband tuned and hits all the numbers. Runs really great as well.
I don't think you'd go wrong with either version.
Build 1: Mk3 Roadster #5125. Sold 11/08/2014.
Build 2: Mk4 Roadster #7750. Sold 04/10/2017.
Build Thread
Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020.
Build Thread and
Video.
Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020.
Build Thread and
Video
Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023.
Build Thread. Sold 11/9/2023.
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