Hi Doug,

As it's a TR7 any carb issue should show in both exhausts not just the left, also carb smoke tends
to be black not white. I'm assuming you have checked that you have oil returning to the tank ?
Wet sumping should clear after a few minutes as the scavinge side of the pump is higher capacity
than the delivery side, does the smoking clear after a few minutes of running ? A compression test
should show if you have a piston ring wear problem, worn valve guides generally smoke worse when
shutting the throttle due to increased depression in the valve ports. Good hunting.

Legion.