I have a 1997 k1500 Silverado on high pinion Dana 60 front and 14 bolt full float rear with 46 inch tires and a 4l80e swap. Using Tunercat OBD2 to tune for 5.38 gears, 4l80e parameters and tire size change. Intrested in eventually replacing the 350 vortec with a Blueprint SBC 454 (575HP/560 ft-lbs) but attempting to use the factory ECM with aftermarket intake since the factory MPFI will only support 400hp or so at best. I daily drive a 2006 Sierra 2500HD LBZ crew cab.