Also bear in mind that tire diameter offsets gearing to some extent, so if your car was originally equipped with 26" tall tires and you go to 28" tires and a 4.10, you're roughly at only an effective 3.78:1 ratio when you compare the tire roll-out. The engine rpm at any given speed is easy to calculate the offset in ratios. Note: assumes a 1:1 manual trans, obviously no compensation for converter slip.

A good cooling system is essential for sustained moderate-high rpm, a higher capacity oil pan with a thermostatic cooler is the best, trans cooler as well. Oil does roughly 1/2 the cooling of an engine and the water and oil work together to wick away heat.