I just finished a 302 Cleveland Conversion fitted to a 2+2 in Vic. Used solid rotors on the front with hilux calipers, R31 Rears and a proportioning valve. I extended the chassis rails to the rear and that was it for strenghening. Brakes pulled a .93 negative G's on the enginneering test which a pass is .8 then on the roadworthy it pulled a max of 1.47 Negative G's. Tailshaft was reworked by a local firm. Is yours a 2 seater? 1100 Kilos means you can only fit up to 4.4 litre capacity.
Mark K