Nice! I was afraid it was gonna be the -3X version, which is waaaay too big for your application. I swapped out a -3 for a 3X and also swapped the carb from a 1050 dom (9375) to a Pro Systems 1200cfm. On a .720 (gross) lift 11.5:1, 4.50 bore 528, It picked up 3 tenths and 4 mph. I was using the 572-13 heads, I was more surprised than anyone  
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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