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If you are new to carbs then PMO is the answer. For your car 40's or 46's will work. 40's are preferred. With CIS pistons and cams you will not have optimal performance, but you are guaranteed more fun and will impress your friends.
The CIS is a better system for your engine. But if you are planning on increasing the performance later with a displacement increase and some cams then go big 46's I ran them on my car before I rebuilt to a 3.2SS and they were great.
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS
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