1986 C10 Rear Suspension with some Power

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1986, C10 SB SS that will be street driven for fun, along with a few errands thrown in. Some 1/4 miles trips too. The truck will get a mild 350 C.I. 400 H.P. @5700 rpms /400 ft-lbs of torque, that is camed for a broad power curve. It is a MY6 4 speed that I will granny shift at the track, to give it a long life. Upgrading 10 bolt to 3.73 gears. The pretty much stock front suspension has been lowered about two inches by cutting one coil from stock spring.

Question: Getting close to a decision on rear suspension lowering to level it with front. From guidance provided here, planning to doing an axle flip, with new 51.5" springs that have more arch to bring the rear lowering to about 3" total. The flip is planned to be done by welding new perches vs kit such as "Western". Any suggestion. Also will be using cal-trac. KOOL-IT suggested I look here for assistance and knowledge.

A few picks of frame cleaned.

Les