My 3100 pound Duster ran 10.50's with a 340, 12.2:1 compression, .672 lift flat tappet cam, W5 heads flowing 300 cfm's at .600 lift and 305 at .650. Still using the 2.02 intake valve. The 4600 T/A converter, 29.5/11.5 tires, 904 with a low gear set and 5.13's. The carb is a self modified 850 Speed Demon flowing 930 cfm's with a 2" open spacer on an M1 manifold. 1 7/8 headers, no mufflers or juice.
I'll tell you straight up that I tried a lot of converters, rear gears, cams and even intakes and carbs to get it where it was. I run the same basic combo in the Scamp except it's a MP 360 short block, not much better than stock, but with the same heads, cam, intake and driveline. It weighs 2600 pounds, uses 4.88 gears and 14/32's with a four link. So far in crappy air it's gone 6.60 in the 1/8th at 103 and 10.45 in the 1/4 at 127. It's nearly 10 years old now and pretty tired so instead of freshening it I'm just going to build a stroker short block and have the heads touched up and 2.08 intakes installed. The only other changes are the 2" primary tube headers and 4" collectors. Should put it in the 9's