After trying numerous brands, the only reliable/accurate brand that we found was made by Denso. They worked the best and that's all we use.  AC/Delco units were once made by Denso but don't know about now. 
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    " THE BLACK PARALYZER"   -87GT 3800SC Series III engine,  custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
            "THE COLUSSUS" 
87GT - ALL OUT 3.4L  Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
 " ON THE LOOSE WITHOUT THE JUICE "