Is the engine still in stock form of has it been rebuilt and bored over? If bored over then manuals specs are a starting point, but then it takes diligent testing to get it all right.
22* total advance at 3000 rpm seems pretty low for the 292 even for a heavy truck application which you aren't.
My '64 292 that's punched 0.040 over with HEI and Rochester B is in a C60 and factoring in a loaded truck at 20,000lbs, likes 7* initial timing and slightly weaker mechanical advance springs that bring in timing at 1050 rpm with full advance of 36* around 3400rpm with vac advance.
On points and without a load, the same engine quite frankly LOVED initial timing at 10* and stock 292 advance springs which followed the factory advance curve.
Thank you. I will adjust the initial timing and vacuum advance to reach this values and will see how it works
I don´t know something about the history of the engine....
Do you have a picture from your Rochester B vacuum port for me?
