TZ 350G was the 1979 model, the first of the "lowboy" frames.

Subsequently there was a TZ 350G, but the spec was identical.

I don't think that Kevin Mitchell would have had a new one, so probably rode an F in 82 - but, as I said, spec was the same.

If it's an original frame, watch yourself. The metal was basically ratdroppings, and the F was very prone to cracking the frame round the steering head, which has been known to detach completely, especially if used in real road races. Not designed for bumps and jumps.

As to pre-TT at Billown, I think you can use it. The only race for post-classics is 230cc to 1000cc, so you should be OK.

But check the bl**dy frame!!!!!!!!!!!!!!!!!