When I used to race my A12 Runner in the early 70's, it had over 13:1, big valves, a .626 lift cam, 4.88's, etc. I tried switching to an Edelbrock TM7 Tarantula intake, a 2" spacer and a Holley 850 DP for a while. It ran the same times and speed but did not get the hole shot my 6BBLs got...and just didn't have the same wow factor to me.
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