My old 94 liked 12 deg BTDC with Motorcraft copper core plugs gapped at .050. It had a good quality Taylor low resistance sprial wire set with OEM type (brass contacts) cap and rotor. Truck was a sb reg cab and weighed about 4000lb. It had 3.55 gears and 235/15/75 tires. The timing and wire change increased acceleration slightly and the truck was capable of delivering 20 mpg at 60 mph.
My 95 is an extended cab with a sb and it has 3.08 gears. I used the same formula as the 94 but i had to back off the timing to 10 BTDC. I used Autolites this time (on sale) set to the same gap. It averages about a mpg less but actually performs slightly better than the 94.
I did consider a "performance coil" but my originals always tested fine and had no trouble with the .050 gap. Some users will open the gap to .055 on the plugs but I was concerned about cold weather starts. You can adjust the timing by using a vacuum gauge and the "sixliter tune up" has been a popular mod.
Regards
rikard