Martyn, Where can I find the vacuum can?

I do have a condition where I am travelling at about 55 mph, maybe 60, and as going up hill climbing in fourth gear the engine or carbs clinks. It seems that I am lugging the motor up the hill. Shifting to third gear at a higher rev would fix this, but the revs seem a bit high. Is this normal for the TR4 engine?


'67 +4 tourer - broken white - RHD