1975 Dodge D300 with 360 The truck has issues. Lots of issues. I'm working my way through them though. This latest one involves the distributor, electronic, which appeared to have had some mechanical issues. Bought a new one, Spectra, from Amazon and installed it today. Set everything to TDC, and everything went smoothly. I expected some tweaking of the timing afterwards, but things are odd. It's not 180* out, since I can get the backfiring to stop adjusting the timing, but I can't get initial timing anywhere near 6* advance (I seem to recall that's the goal). I can get it to run pretty smooth, haven't tried driving it, with the vacuum advance connected, but without it (and the vacuum line plugged) it doesn't run well and the timing mark is nowhere to be found by the light. Any thoughts on things I can check? I thought about moving the plug wires one plug clockwise on the cap. Since somebody will ask, the big issue, I thought, was vapor lock. But I've isolated as much of the fuel line from heat as I can and it hasn't been that hot out. Also have a 1/2 inch phenolic riser under the carb (quadrajet, don't ask, long story). The carb is set up for a Chevy 350 and was recently rebuilt by somebody far better at than I am. Further research shows that issues with the distributor can present as vapor lock as can a failing fuel pump. The new fuel pump came today and I haven't installed it.