I believe its a fairly straight forward job to re tune the TR6 engine back to higher spec.

Camshaft - From about £130 reprofiled or at lot more for a chilled cast iron one (new).Cylinder head - Stage 2 modified using your head - from about £500. Pair of rebuilt SU HS6 carbs on manifold with linkage - about £230.Distributor (a lot of people forget this) - about £150.Exhaust manifold and system in Stainless Steel - About £500.