id personaly run a 75mm on a 347..i run a 70 on my 306 becasue i have ported heads, intake and a huge cam..the MAC tb comes in a 70mm for 5.0 and a 73mm i belive for a 4.6.
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1987 black notch(ex 4 banger)
DSS 306 w/ main support...Elderbrock 6028 heads..gt-40 intake..24# injectors...70 mm tb..77 pro-m...accel 300+..mac full legnth..tremec w/ pro5oh...full MAC exhaust,off road h-pipe,long tubes, catback...ron davis radiator..subframes, control arms...CFDF II..o yea holley FPR sucks..dont buy one..
AIM=onesillynotch
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