you should need is a cam and pistons. Both had the 4BBL also.       The L46 was an optional engine on the 1969-1970 Chevrolet Corvette . It was a 349 hp (260 kW), 380 lb·ft (515 N·m) version of the ZQ3 with higher 11:1 compression. 1969 Chevrolet Corvette 5.7L 4BL