If it is almost always track, spool. If it is a mix consider a real good differential like a Wave Trak style or the best you can buy. I've had three wave trak (or however they are spelled) and they are awesome. Totally quiet, smooth, no surge turning, and they always lock both wheels. They handle a ton of power in the 33 spline model.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)