340 A body versus 383 B body

I remember a couple tests in adds for RR/GTX, (wanna say 1969) that tested a hemi car with Ro McGonagall and Ronnie Sox driving a four speed. (and I think they did the same with a Sixpack, later.) Sox was about 1.5-2 tenths faster than a talented amateur. Ro ran 13.07/13.11 in the A12, Sox went 12.91. (you can bet they were tuned within an inch of their lives!)