You need to recognize that there are one, 2, and 4 ground pin style platinums, and there are copper core, non copper core, resistor, non-resistor, with and with out platimum coated tips. I found about 30 different plugs in the AZ data base of plugs available for 4.0s recently!
I have used Autolight and Bosch single ground resistor platinums with no problems in the older renix 4.0 engines. My 89 has the Autolight single platinums stock heat range (or what ever the stock crossover is) and they run great. I hear the 2 and 4 ground platinum Bosch does not work properly in 4.0s.
5-90 runs autolight single platinums too in renix, IIRC.
Regarding heat range, # of ground electrodes, etc., if you want to talk plugs, you need to get down to the exact part number you are recommending, or saying works, doesn't work.