How to wire a sbc small block chevy 305 350 duration. Need diagram here is the firing order diagram for the 5 0 liter 305 5 7 liter 350 and the 7 4 liter 454 v 8 engines note position of locking latches screws between the 3 and 6 and the 1 and 2 terminals on the distributor cap. 1991 1994 305 sbc ignition coil cap rotor replacement duration.