traction problems.....please help

[dragstang86]

I ran my 90lx for the first time tonite. I was hoping for high 12's or low thirteens but i only ran 13.70 @101. I spun terrible. I have a c-4 tranny with a 3500 stall and 373 gears and 10 inch hoosier quick time street slicks on it. I hook much better on the street then i did at the track. Makes no sense to me. The first time i got the tires nice and hot and i spun terrible the second i just spun them enough to make sure i got the water off and spun a lil worse. I have lakewood shocks and springs, aftermarket lower rear control arms, sub frame connectors, strut tower brace... I expected more out of this car. Anybody else running a C-4 with a high stall convertor on here? What do you guys think it should run with this list... Also what should i be shifting at??

306
9:1 compression
E cam
gt-40p heads
cobra intake with ported lower
roller rockers
70mm throttle body
bbk cold air intake
shorty headers
x pipe no cats
flowmasters
50oz flywheel
aluminum driveshaft
373 gears
msd 6a
No AC
no smog pump


Thanks for your help,
bryan