Vacuum Secondaries

Yeah...general purpose and SLOW:(:D......we ran a 750DP on my mild .484 cammed '71 340 on the street and strip...was 2/10ths slower than an 850DP when we stepped things up some. Tried a 750VS just the once to see the difference and it was total rubbish compared, we even came across a 1050 Holley 3bbl which we ran on the street for a while but even that wasn't up to it. Can't beat a well tuned DP in 800>850 or even a proper 950 depending on how race oriented your combo is for general purpose use.....my2c's