LT1 Optispark/timing issues

[WS6]

no need to buy a new starter yet. If the motor is turning over and it doesn't kick back, then it's not the starter. By kick back I mean the engine goes to start but the compression and explosion inside the cylinder overcomes the starter and pushes back against it. It doesn't sound like you're even getting to that point. So you're still not getting fuel, air, and spark at the proper time. One or more may be missing or they may simply be getting there at the wrong time. Don't start throwing parts at the engine. Go through it step by step eliminating the possibilities first.