Its a hard question to answer, because you can either go with the recommended pressure for the P38 (28psi front, 38psi rear), or go with the recommendation for the tyres on the L322.
Neither is right or wrong, as the best pressure to use is based on experimentation with the whell/tyre/car combination, which you should do yourself by varying the pressures and finding the ones that work best.
Have you tried them on the car yet, I can only imagine it will be an uncomfortable ride whatever you do.