First take a drilling machine and something that has the same shape as the Distributor rod. Pull the dizzy and spin the oil pump for 2 minutes -

Pull the plugs and squirt some WD40 in.
Than crank it carefull over several times.

Prime the carb with some gas and a have someone to help you with starter spray

you should have enough oil pressure now for
a save start.

Don`t rev it up to high bevore operating temperature.