2+2 = 1200 kilos X 5 for National code 6 Litre maximum capacity. What about a Chev? I just fitted a 302 Cleveland to my 2+2 and using an engine of the same year model means emission laws may not apply pre july 1976. Aluminium manifold and heads would bring it back down to L Series weightish and the vehicle will need brakes capable of stopping it from 35 KPH in a distance of 12.5 meters. 10mm Clearence is required around all of the motor. Or have i said too much?