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Im on the wiring harness rt now. Need to figure out where it ties into the toyota.I run a 4.3TBI w/R150. Do not use NWOR stuff, sucks. Largest rad you can fit. Leave good clearance for the distributor (if it has one). $ander$on headers. Jags That Run speedo convertor. Everything is one-off regardless of how vendors say it will fit together. Be ready to be frustrated and learn loads. IF you planned on 'X' amount of $$ for project you planned too little
Did u remove the toy computer?I used an '82 2wd diesel rad, factory 3 row. Howell harness. Chopped up some Astro van tubular headers to make them fit for both sides. Remove the front solid axle torque rod and tower if it's still there. Put the GM computer in the PS kick panel, placed in the Toy location. Would be better up behind the glove box, requires glove box cutting.
I'll try to remember stuff and come back and post about it. It's been over 20 years since I did mine so be patient please.