Gary---Compare, if you can, the routing of your fuel line to another TR6
that does not have this hard-starting-when-hot problem. (Most do not.)
Starting at the fuel pump, note if there is any difference in the
routing, or insulating grommets around these lines. It would be tempting
to wrap all lines and related parts, shielding them from nearby heat
sources, but this is not what the factory did, and should not have to be
re-engineered in your case.
You can also feel the bottom of the carburetor fuel bowls immediately
after shut down, then note if they get a LOT hotter after a few minutes.
Some heat soak may occur, but shouldn't be enough to cause the hard
starting.
If you find nothing unusual, it could just be that your air/fuel mixture
is on the lean side. This has been known to cause hard starting in
situations such as yours. A quick remedy/check for this is to enrichen
the mix in both carbs an equal amount, as much as one full turn on the
internal adjustment screws. It would be rare to have to go more than
this, if your car is now performing "great". (You can always return the
carbs to the present setting, should this richening not help)
Dick
'73
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