What kind of times did you run in the 1/4 mile, what kind of RPM are you doing through the traps(traps is the correct terminology?) with the 411's.
(hope that Quote thing worked, I'm still learnin this forum tech stuff).
I ran it 2 summers ago in Marion SD and ran 11.90@ 110.(cross the traps @ about 6500 rpm. I normally run it at the local 1/8th mile track. It runs fairly consistant 7.5-7.6's @ 89 mph. I haven't had the engine out of the car in 7 years. Its a 70 340, stock crank, stock rods, TRW forged replacement pistons (10.5:1) MP 557 solid cam, 915(J) heads that I ported at home myself, MP single plane, 750 HP Proform carb, 727 auto with 2.77 low gear set, manual reverse VB, Frank Lupo 5000 stall, 8 3/4 with spool & 4.10's, Orignal 73 Dart 340 leaf springs with Cal-Tracs, 3275 Lbs with me in it. 90/10's up front w/6 cyl torsion bars. If you have any more questons, don't hesitate to ask.