sound's about right. . . i had 1980's C-60 with a 350 that would run 65mph@3250rpm. . . with some over sized tire's. . .I put 11.00R20 T-831 Firestone tire's under a 8.25-20 Truck. . .

what will that 478 Hold for R's about 2500 ? 2750 top's ?

mike

1962 GMC K3000, GMC-379 V6.