Not familiar with this particular engine but have helped get some foreign to me engines running:
Ignition timing? Double check cylinder numbering and plug wire location and check rotor direction. Correct dist cap/rotor/plugs? Point gap correct/no slop in dist shaft? Fresh condenser?
I'd be tempted to do a quick compression or leakdown test if you haven't already to make sure valves are sealing and not adjusted wrong.
Fuel, Cam timing, Ignition timing, Compression and spark - if all are where they should be, it should run somewhat...
Is it cranking fast enough?
1938 Canadian Pontiac Business Coupe (aka a 1938 Chev with Pontiac looking front sheet metal)