Which alt to use ?

The simplest wiring to understand and the most straight forward install will be a Chrysler with a one insulated field terminal, and a positive controlling regulator.
A later Chrysler with two insulated brushes will fit and work the same if one is grounded.
If the car will need more electric power (ie EFI, electric fans, etc) then look at the 'Denso' alternator setups AndyF has made brackets for. Wire to use the matching regulator. Increase the alternator and battery output wires sizes to match the demand ((ie EFI, electric fans) and the possibility of higher battery recharge currents.