Pk to PX engine mounting conversion


Does ne one know of where i can get an adaptor to convert a PX engine which has been trimmed to fit a PK cut down frame to fit back in to a PX frame? (still with me?) My PX engine was cut to fit a pk chop but iv just got hold of a new/old px frame and want to put it back on.I dont perticulally want to have to fit a new case cos the engine is fine and in working order.