Cylinder heads?
If it's a quench engine, i could see 32ish. If it's a stock iron head, that's pretty low in most cases. We do have dogpiss for gasoline out here. :)
245 at .050 it will likely want 22-24ish for initial timing. 20 is a good starting point.
Simple test, start car, turn distributor a little CCW. If it picks up RPM, it wants the timing. Reset idle speed, do it again. Keep twisting it a little at a time. Find the point it doesn't pick up. Turn it off when warmed up and see if it restarts easily. If it kicks back or rolls over slowly, back out a little at a time until it starts at a flick of the key. Put light on it see what you have for initial timing.
If it's not pinging under load, start turning timing into it and find the point it starts to rattle. Back it off a couple degrees and get a timing reading. Rev it up until it stops advancing. DO NOT pick a number and think that's it. You may have some advance above your picked RPM number. Use a light and verify. My friends killed and engine doing the 2500 number...
Good luck with it.