This is my first toy its a 85, I am putting a msd blaster coil on it, the old one went out and it was cheaper then stock. Eventially I want to replace the whole system. on the plug that went into the old coil there was a black and a white wire. What one is positive and what one is negative?

 

Welcome to YT! the search function works out pretty good.
try this link to factory service manuals
the 1st one is for 79-85 trucks and is a 58 MB down load...has the wiring diagrams