340 Timing Question

I'm new to small block Mopars,always ran big blocks & hemis. I traded for a '69 Dart with a 340 +.30,12.5:1 compression,eddie heads,.620 roller cam,MSD 6al & billet distribtor with heavy springs. I know small blocks like less total timing than big blocks but really not sure where to time this engine. I don't have the funds or time right now to track test it,just looking for a good starting point. Thanks