the basic diffrence in the 240 /260 and 280 motors is size in liters the 240 being 2.4 liters and so on , but the carbs are key on the motors the best being the 4 screw round tops su's and the 3 screw round top su's basicly the same , the 260 and 73 240 had a flat top hitachi which are not recommended , or you had the 280z fuel injection which has its pros as well , some people prefer the su's and some prefer the FI but as far as the basic block set it its mainly size , good luck , check for the cancer all over the car , floor pans rails and under the battery tray , also under the hatch ,![]()
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