Base timing. Really ?

40 is a bit much. Usually small blocks like around 36 total give or take, big blocks a tick less.
I set my 360 to 16° initial timing. Distributor is from fbo with limiter plate. Cam is the 292/508 mopar cam. Seems to start fine. Also runs well. Question is can I try more initial or just keep driving? Really only left this way since it came @ that setting since purchase. This distributor was used before with 280 mopar cam too.

I would say put a vacuum gauge on it and bump up the timing 2 degrees and see if the vacuum goes up and it idles better. Than take it out and stomp on it. See if it ‘pings ‘. Go from there