I have 138000 on mine. I did change the mains they go on 302's. I also studded the mains. I did this with the motor in the car. Although it was difficult it can be done. I also use TF TW heads new out of the box. I also think you need 36 pound injectors at the least and a 255 pump
1986 stang with TF TW heads and a Street intake, 36 pound injectors and pro-m calibrated MAF, 89 computer, Borla exhaust, Stock TB and CAM, roller rockers 1.6 ratio, stock shortblock with studded mains, and a T-5, twin T-3 .60/.63 turbo's ITS heafers and downpipes, Huge 24X16X4 intercooler, Autometer gauges idles like a kitten with stock computer!!!!