Hi Gordon and welcome to the British Car Forum. ā73 TR6 is a good choiceā¦ I like mine too
As far as the temp rising:
Is the cardboard radiator shield in place?
It ducts the air to the radiator and helps with cooling. Since they were made of fiberboard they didnāt hold up well. If yourās is gone I recommend a replacement.
Also, check/replace the air cleaners and the dashpot oil in the carbs.
As David suggests, head over to the Triumph section and post your questions.