Combo:

71 dart, MS & brakes. no AC
360 magnum short block (stock with alot of miles)
RHS heads, re-ground stock cam from bullet.
(.477/.477, .218/.218 @50 112 with stock 1.6 rockers)
Crosswing RPM, 750 3310.
Summit headers & turbos, 2.1/4" exhaust
904 with cheetah FMVB, 11" PTC 2800
3.73s, 255/60/15 MT DRs
stock springs (clamped)

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