Recently dropped in a crate motor from Jeggs into a 2000 Chevy C3500 SWB with the 5.7l 350 Vortec. Everything was running pretty good before all this mess. After 2k it was time to readjust the valves after they fully seated (roller cam with rocker arms and pushrods). Stripped it down past the lower intake manifold re did the valves. Removed the lash, cleaned block of residue and old gasket material, new intake gaskets, torqued down intake bolts accordingly to specs, timed my distributor (cyl 1 on TDC making sure intake just closed rotating crank.) set cap pointing at #1 cyl, put the rest back. Fire it up and it wont turn over. For giggles enjoying the gun shot noises I turned the crank with distributor out a full 360 thinking just maybe it was 180 degrees out and still nothing....Put it all back to TDC and still just backfires through the throttle body and exhaust. Plug wires are in the correct spot, distributor points at #1 cylinder on TDC and it just sits there and back fires over time. Fuel pressure is reading 50-55 psi when primed and 60psi when trying to start. Plugs are firing when grounded, Fuel is there and it is in time. I have no idea why it wont at least sound like it wants to turn over. Any help is appreciated. No compression test has been done yet, but I did have great oil pressure before I did the valves. Im starting to think its the Ignition control module acting up.