Richard
I don't know the exact torque figures but I was talking to Rinus Sinke at Silverstone on saturday. His yellow Healey is one of the fastest in Europe along with Jeremy Welch and Anders. They voluntarily restrict Rinus's car to 7500 revs but it has been to 8000.
I find the rules are a bit mixed up depending on the series. Some things are strict some there is more flexibility. For instance, steel cranks and alloy heads are accepted, aluminium radiators aren't. Alternators are, electronic ignition isn't. Alloy body panels are fine, although Rinus doesn't have them.
Torsion bars are not allowed but the car is running on Minilites which are not allowed at FIA events such as Spa and LeMans.
This year Rinus' car hasn't been accepted at the Le Mans Classic because it doesn't have any 'history'. A shame because it has been fastest Healey at the last two Le Mans!