
I'm sure some of the best 750mc spec engines have managed about 100bhp.
That's with the +90 overbore (1380cc.) Decking the block to the lowest piston, machining/balancing the remaining 3 and fitting a minimum thickness head gasket would up compression.
Bolting on the GT cam, twin choke weber, air filter and noisy exhaust is really all that remains. 100bhp still seems like an awful lot, maybe it depends on the rolling road you go to

The racers muck about with gear ratios though. You can use any production gearbox that was fitted to the Escorts, or a Sierra one. You can also use any production rear diff ratio and there are loads . . .
But no, the races are all down south

Thanks for all the comments folks, I'll keep the pictures coming!