68 Dart first time out

Conversion chart 1/8 to 1/4: http://www.empirenet.com/pkelley2/eight-to-quarter.htm Looks like your 8.40 is a low 13. Nice.

Looks like that 7.71 is about a 12.00 in the quarter. REALLY nice! Sounds like a fun ride.
The right convertor, like Petty Blue mentioned, would pick you up nicely. The RIGHT one would still be ok on the street.

---Drag racing is addictive... a little more convertor, a little more carb...