1980 chevy C-10 i need help

ok so i bought a truck for 200 bucks and everything has been changed around on it.
it was a manual. now a automatic. new column that doesnt match and most of the motors are bad on it ive been looking for a place that i can find new parts for it but nothing has come up yet. local junkyards have nothing that is in better shape then what i got. and some wires are missing  the only main one i want is for the radio i dont even know what it looks like. i found a plug but its only has 4 wires to it and its not like a radio plug.   as of now the truck runs reverse is out but it runs so theres nothing missing that it needs but id like to put it all back together and fix it up   plz if you have any websites that can help me post a reply plz