T160 Valve Stem Seals (or Not)

Gday all.
Finally got to start reassemble of the T160 (1975 model) and before I put the head back on, I am in two minds whether to fit valve stem seals. I know they didnt originally come fitted, but I'd like to minimize any smoking. Should I put valve stem seals or would they greatly reduce the service live of the Guides/stems? Were the T160's prone to excessive valve guide wear, and hence the lack of seals? Your opinions will be greatly appreciated before I replace the head.
Cheers.

 

Thanks for the response. I haven't had much(or any) experience with Triumphs in the past, so I guess the amount they smoke without valve seals and premature wear with them would be the deciding factor for me. The head has been rebuilt with new valves and guides and i will be running 20W/50 mineral oil. If the T160 run fine without excessive smoking then I would prefer to run without seals, but it's hard for me to gauge how badly it will smoke.
the last time the head was rebuilt, it had seals installed and when we stripped it down this time the valves and guides were badly worn, so that is what is making me think that it will suffer premature wear with seals installed.
I'm wondering what other peoples experience and opinions are?