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Welcome again and my first suggestion is get a Moyer Service manual - best $50 you will ever spend. Your rpm issue could be something as simple as idle adjusting screw set wrong - literally a 10 sec fix, no tac needed [I haven't used an on board tac in 40yrs]
Relative to the hard shift the number 1 culprit is usually a rusty cable inside its sleeve - on a "72' this is really possible. You can test this by disconnecting the cable from the shift lever [maybe a clevis pin ana cotter pin] at the rear of the engine on the left side as you are looking at the flywheel. Try shifting the lever by hand and see if it smoothly with some effort " snaps" into forward. If it does you need a new cable. There is also an outside chance the cable clamp is too tight.
The reversing gear assembly ie" transmission" under the cover plate has an adjusting collar that can be made to compensate for past wear/slippage going forward. It is possible that the previous owner may have adjusted it - a one notch adjustment can solve a slippage forward problem but dramatically increases the force needed to activate the shift lever. This aspect is difficult to explain in a post but is detailed in the manual and possibly elsewhere on the site. Good luck.
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