i have a 1988 318 that i swap in my truck and i was wondering if anyone knows if it is ok to use 1990 wiring harness...........

As far as I can remember, the V-8 harness is the same. Some trucks had a 904 trans, as opposed to O.D. The O.D.s had a dash mntd. switch and related wiring.
You areusing the 318 fuel inj. since your dumping the V-6 right?

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yeah! 318 fuel inj, also i got o.d. transmission in so ur saying i could use the same harness......

my transmission is A500

lugnuts, why is the A500 trans not that good to have? i want to know if i should rebuilt mine or go look for a new trans..... cause i read that some have there 500hp motors bolted up to A500,