Looking for some insight about reprogramming my ecu. I have a B20B in my 91 teg, keeping it non-vtec. Head is gettin full treatment p/p, valve job, milled, etc, crower 403's, skunk 2 im, bored tb. Should I use a SAFC or any other suggestions for tuning???, planning to use stock fuel system. Also if gettin Crower 403's is it neccessary to buy new springs and retainers?? Thanx just want to have everything dialed in.