Mine is a 2nd gen and it regularly boosts 40psi, even towing without a problem. I'd say your safe at 33 if you don't let the egt run too hot for too long. If you over boost it, you could end up needed a head gasket.

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram