Dilemma on a Duster - 71 or 74

I own a 71 dart also very quick 10.60s on the footbrake at 1700 rpm launch lol, I have a 0.60 over 440 in it,eagle rods,srp forged pistons,comp can roller .660 single pattern. duration at .050 is 272 on intake and 280 exhaust,ported head flows 329 on intake at .700 sharp 1.6 rollers ss shafts,M-1 intake with integral valley pan built into intake, 1050 dominator, 2 inch fenderwells with 3.5 collectors, trans has ta 4500 converter,kelvar bands, aluminum drum manual valve body. rear is 8 3/4 with spool and moser axles with 4.30 gear. all msd equipped, $600 dedenbear delay box trans brake, line lock, cheeta sc shifter with line lock button,I dont use the line lock as its not required haha and I dont use the transbrake as I have a standard capacity trans pan and leaving the line with this engine I fear will break my driveline. this thing is a monster .my bet it would go 9.90s with a dana has springs moved inboard adjustable coilover shox . The car is beautiful and easily street legal as it runs aluminum heads and I run a 50 50 mix of 110 and 93 as compression is only 11.5 to 1 with the aluminum heads.wildwood adjustable proportional valve located next to driver, 8 inch cowl hood, when this thing fires it shakes the whole house , rod type snubber that doubles as a pinion angle adjuster. 10k email me at mopar1962@adelphia .net for a few pix dont have many but give you what I have. ok, next car,,,,,,,,,,