well weve had this black 1986 chevy for about 2 and a half yrs now. when we got it it had the 305 in it but then we took it out. bought a 350 for it bored 30 over and has been runnin great ever since till this week. we changed the starter,alternator, and the whole wiring system. when we turn the key theres nothin no noises or anything. any ideas on what could be going on with it