I have a 454 in my 87 S-10. I installed a 6-71 blower this winter.I used the 660 center squirters that came with it.I was starving for fuel so i re-jetted to 92 jet size and drilled the plates.Now i have a cracking in my mufflers around 4000 rpm and smell gas.It seems too rich.If i drive it hard and shift at high rpm's its better.Are the 660's ok for the street.Did i over jet.Any help would be great.!!