Doing some mild upgrades/maintenance to my Motobecane 50V. Anything I should get?

I bought a $150 1979 50V last year and got it running. It runs like shit and I think the last guy jetted for no air filter on the carb since it came to me without one and runs much worse after adding. As far as I know it is completely stock.

Getting ready to order some upgrades/replacement parts for the Moby an it’s hard to know where to stop. So far I’ve got:

Dellorto 15.15 carb with shims/cables (treatland deluxe party)

variator belt

Brake shoes F and R

Tires

Carb jets in the 50s

Is there anything I’m missing? Maintenance I should do while I’ve got the carb off?