blueprint 383 stroker

I've got a Blueprint 3830CTC1 (w/Edelbrock carb & cast iron heads) (405 HP, 440 torque) in an 86 Chevy K-series pickup with 5300 miles on the engine. Truck has an automatic transmission with 35 inch tires and 4.56 gears. Engine has always run good, especially the top end - even though it is...