Quote: So, jet up primary or secondary or both?????
Both, but remember, if you don't run "extentions" you'll more then likely (most definitly) loose 60ft. times, there goes your whole purpose of any gain , sure un-corked exhaust = HP, but you also need some back-pressure, otherwize you push the torque curve way up & there goes your 60ft., so run at least 18" extentions or install cutouts (dumps as i call them)
Start off with the jets you have now, make a pass, then jet up 2&2.
75 Duster, 451 10.87 @ 123.58 NA
97 Z28 6sp., 12.01 @ 115 on a 100 shot
71 Swinger. 360 magnum. 12.58 @ 105
78 cutlass, 469 BBC. 12.70 @ 108 on street tires.
http://www.youtube.com/watch?v=Z2kqNmMfheU
, sure un-corked exhaust = HP, but you also need some back-pressure, otherwize you push the torque curve way up & there goes your 60ft., so run at least 18" extentions or install cutouts (dumps as i call them) 
