How hard can a 273,run? (street/strip)?

Abodybomber, I am the guy that Darter6 was referring too. I have a full interior 68 Dart 4 door. The car was street /strip and ran 12.60's at 104 with 1.68 60 foot times. The key is RPMs. I came out of the hole at 3800-4000 RPM. Shifted at 6800 and went through the traps at 6800. 273 30 over 10.5:1, 557 mopar solid cam, ported 360 heads, rpm manifold, 700 holley DP, 904 4800 stall, and 4.88 gears.