There are several reasons the TR engines runs hot , so sort those first.
1 A really good flush to clean out the deposits at the bottom of the wet liners in block, this may involve some back flushing.
2 If the ring gaps are set too tight , or the pistons too tight in the bores then friction is inevitable and heat will build
3 The advance retard needs very careful setting to cope with modern fuels
4 You can try running the fuel air mixture slightly rich rather than lean but this is fraught with other issues.
5 Are you sure yo don't have a slight head gasket leak into the water jacket, this will heat up the water way too quickly
6 Is the radiator fully cleaned out , again a back flush may be useful
7 Are you sure the hoses are not collapsing under heat, this can restrict flow
8 If all the above pass muster , then a larger radiator can help.
9 An electric fan driven by an other switch can help , but you have to make the decision whether you want a puller behind the radiator (not a lot of room) or a pusher in front (obscures part of the radiator)
