I agree with Tom 100%.In the old days(remember i'm old)the aussie formula 3 cars and clubman sports cars either ran a12's or the comparable toyota 1200cc power plant.If you did'nt have a minimum of 140-150 flywheel horses you would be best to leave the car on the trailer or be ready to cruise around at the tail of the field.
On the A10,those big numbers where possible but they where hand grenades and it was normally the 3 bearing crank that caused the dramas just as it is with the morris/MG products to this day