You are very lucky to have a Tyme Cub wood lathe donated, it is a very good machine, very well made and extremely strong. Parts and upgrades to take modern head and tail stokes are all readily available. The standard Cub has just a 3/4 inch hollow centre thread, this hole takes a MT1 head stock. The tail Stoke is also MT1 - MT for Morse Taper. The Nova or SuperNova G3 would be a good scroll chuck to use and will come with the correct fittings for a Tyme Cub when you order it. Secondhand chucks are readily available but may have faults. This is a good strong machine, and the headstock rotates for bowl turning. I own such a machine and if yours has been well looked after will outlast many of the latest all singing and dancing machines from far off countries.
Regards