TBM .... But wouldn't a Zetec conversion lose you your Historic classification due to a change of a major critical element of the car.?
Seeing as I just checked mine and being historic exempts me from all the low emmissions zones popping up (including the London ULEZ) .... with the possibility of climate justified restrictions creeping in on ICE cars going forward, the Historic status might be worth holding onto.
Cams and minor headwork will get you a reliable 115bhp or so out of a Kent (much more available if that's your thing) .... very tried and tested mods available for that motor.
K
