I don’t recall my old softail being rubber mounted.
Older Sportsters and Softails both have rigid mounted motors. But one of the main differences is that Softails have balanced motors and therefore should be a smoother ride than older Sportsters.
Well I’ll be fucked ,,, I would never have thought there’s no mounts !
Yes, I would torque all the bolts that hold the motor to the frame. Motor mounts/bolts coming loose is quite a common problem.