My restriction is always my heads. Their stock. I don't have anything but cheap Summit headers coming out either. But a big shot of condensed air along with an extra shot of fuel could make things happen quickly...
Are they 360 heads?
You should pull them and do a 318wr port special on them he says there is about 4 tenths right there. I know you have done alot of changes to your car recently going from a full race to a street car. What all did you change? Cam and full interior?
