Using a distributor on a T engine and setting the timing kinda depends on how exact do you want to be. I guess thats true even without a distributor??
TW components here in Indy makes this tool available from many suppliers.
It screws in the t head touches the piston top and is degreed with markings. His instructions show the specs for all the T engines...
Also there are marked pullys available from other suppliers to allow the use of the timing light.
My preference for the T engine would be a full automatic advance distributor set up for the ts low rpm. Set it and drive it , no spark rod needed..