Butler Performance in Tennessee recently blue printed a Pontiac 421 Super Duty as it came from the factory no changes were made and it put out 100hp over the 1960's advertised amount. The Buick GSX Stage 1 put out the most tq ever produced in the era. I would build Gen 1 GM power any day...
Welcome to SM. These cars are full of suprises and expenses, I didn't think it was going to cost as much as my 64 SS Impala 4 speed, 406 sbc pushing 540 on pump gas.....I was dead wrong. Best of luck with all of your vehicles.
I think most of us that own these cars come to that realization sooner or later. I bought my car for dirt cheap and when I started adding up receipts for the past two year I saw that I have spent multiple times the amount of my initial investment. And that was just replacing parts and restoring...
There are differences in the 86.5-88 and 89-92. 89-92 used grey plugs while the previous years used yellow plugs. If you are trying to use an 87 harness with an 89 ecu, I can tell you now its not going to work. Your best bet is to use a harness that came from your year model supra.
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