Grab as much initial as you can. To much is when the starter complains. If it complains when the engine is cold, to far, recheck when the engine is hot. If the start complains when the engine is hot, retard until it stops bitchen. Figure out how much that is and recurve your distributor.
The more initial you have (to a point) the better your car will jump off the line and respond better.
At your 12-34, it should feel good. I myself would try (experiment with) a 2* less timing. If you race the track, you may see something. For some reason, I don’t think that 340/373 stroker has iron heads and exhaust manifolds on it.
