The steering box should have a lower mounting bolt that is slotted in the frame so it's shaft angle is adjustable to line up with the steering column. That is a good reason to keep the box to frame bolts loose when replacing the rag joint, and lower column bushing. Tighten the frame bolts last after so there is NO binding anywhere in the system.
Sure, roller cam too. And don't use 50 wt oil! With modern thin low tension rings, it will rev to the moon, and make more horsepower than you ever imagined!
I worked on both these cars. The one in question hasn't run in many years. I wouldn't attempt it without going through it completely. The Turquiose one I recently refreshed the valvetrain.
Usually it is the mechanical sweep sticking on the ring magnet inside the tach. You will have to center the magnet, and set it with superglue.
Usually they hit around 2500 RPM.
A 67 would be the same as Studebaker versions. The outer rubber is replaceable and slides into the stainless channel. Available from SI. No need to reinvent the wheel.