Clutch release problem

Thanks guys. Not sure I understood much of the details above, but some. While I know that the trans itself could be a problem, my gut says it is more about clutch and or pilot bushing. I read that these pilot bushings are very durable and long lasting, so that's that, but also that they can contribute to difficulty in shifting into gears at standstill. Maybe I am wrong about that. As for a warped clutch disc, I do not have any vibrations whatsoever during engagement or driving down the road. Seems like a warped disc would create some chatter at engagement. Again, may be wrong about that too. The car is quite original and is an authentic H code 340 Swinger, so Z bar and other components are stock to the car. I did look carefully at the Z bar and the adjusting rod, fork and other components to make sure there is nothing unusual or out of alignment. All looks good from that perspective. An expert would find a problem that I would not see however. As for fluid, I read lots of threads on fluid and see pretty much a split between GL-4 Stalube and the Penzoil Synchromesh gear oil ( which is not synthetic, but measurably thinner than the GL-4 for certian. Sounds like I should try taking a bit of time ahead of reverse shifts and see if that helps. If the trans needs a rebuild sooner than later, that is not horrible, but was hoping to get some use ahead of that day I know there are a number of sources for rebuild and I've gone that route before in my Buick days. I'll plan to get a Macleod Street Clutch kit and a new pilot bushing and start with that to at least eliminate those issues and know exacly what I have in there as a good start to owning this car. Lots of paperwork with the car dating back over 20 years, so that is great but prefer to know precisely what is in there and it's condition. Really appreciate your help with this.
One last question, is a bushing preferred or do most go with a bearing when its time to change it out? I would say quality bushing , but interested in what others have to say. Many thanks.