hello Anton, the thing you need to remember about the 7 type car is that it only weighs 600-750kg so you get a better power to weight ratio than a turbo 1.8 zetec in say an escort. You might find that a 2ltr zetec running 40 or 45 webbers or even throttle bodies with 3d mapable ignition may well give you a very reliable 220-240bhp with better all round traction. I think your bigest problem with that much power might be finding the right size wheel and tyre that are narrow enough for the low weight of the car but grippy enough to make use of the power.
As for the clutch,gearbox,diff etc it's all made to push a car weighing 1200-1600kg along the road with 110-200bhp so a car weighing nearly half that it'll be more than capable of handling the extra power. The brakes I would have thought maybe a different matter. Make a heavy car go faster you need bigger rotars and monster calipers but in a light weight roadster the standard calipers may well be up to the job with added drilled disks and green stuff pads.
I hope what I've said is more or less right I've been playing with grasstrack racers for 7 years and have found the breaking point of most things along the way.
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