I am in the process of replacing a 6 cyl. with a 350 V8 in my '82 Chevy PU I am?

well...your 82 is an early computerized vehicle [ unless it's a truck,then it depends on the model] so you should have the H.E.I. ignition system. now does your 350 have the same ignition? except for two extra spark plug terminal,s? if so then red wire,s are hot lead,s, black are ground,& what,s left are for tachometer/computer information...you should be able to connect the brown & green together but without researching the wiring diagram,s I can't say with certainty...it's been a long time since I worked on that sort of modification...also does your 350 distributor have pick up coil? next to the ignition module? if so you will have 2 extra wire,s to contend with...is it equipped with a vacuum advance module or pod? these thing,s should be taken into account if your going to use the stock computer...your best bet would be to use the computer & ignition system [ as well as all other sender,s & control,s] from a donor vehicle of the same or close year & model....good luck!