Your 302 has an earlier EFI system that allows some timing tweaking , the closer to 1996 (and the dreaded OBDII) one gets, the less likely it is that timing can changed. My 1996 F-150 with the 300 six has a distributor, but no provisions for timing adjustments. You can twist it all day long and the processor will rest to where it wants spark to occur.
-Carl