The CA engine should "bolt right in" everything should fit and function, linkages etc. should be the same.
The CA engine is a much "better" more modern engine with full pressure oil lubrication on the main bearings, camshaft bearings and the Connecting ROD bearings. (The original C engine has oil pressure lube to the main bearings and cam bearings only with the connecting rods lubed by a "stream or spray" of oil from holes in the camshaft.)
The CA engine can have the horsepower increased with an increased bore cylinder and high compression piston - sleeve set and still hold up well. Hope that this helps.