A little background on the combo first...
The car is a '73 Plymouth Scamp.
318 .030 over
about 10.5:1 CR
Comp 282 Solid 236*@.050, .495 gross lift
Victor 340 single plane intake
J heads rebuilt/ported by Aerohead (Indy)
1 5/8" headers to 2.5" duals
9.5" PTC converter (brake stalls @ 3500+)
3.91...