Just bought a 82 Silveraldo

[coke_and_stuff]

Hello I have a few questions maybe some of you can help. I bought a 1982 Silveraldo LWB a few weeks ago it ran good I decided to do a couple things to help it out a bit new plugs, wires etc now it just doesnt seem to run as good, whats the proper plug gap?, Maybe its the wires? It sounds like a miss ive checked the firing order several times if its off it wont start at all any ideas or suggestions?? any help is appreciated.

Thanks

Joey