I race against Dave Montley car in a few races. It always had a type 4 engine. It was the first car that had the angle of the pivot bolt changed for trailing arms that greatly cut down on camber change in the rear suspension.
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The original weber air correction jets had a chamfers on the air inlet of the jet. It may make a different, but your main challenge is to get the main jet correct. Then work with the air correction to fine tune the higher rpm air/fuel ratio.