Iso concentrated on getting the A3/L ready for production, concentrating on some of the design changes that had to be made to the prototype. The car got a light face-lift that made it less aggressive in appearance. It was given a modified but reliable 5.4 litre Chevrolet small-block 327 V8 engine—having variable power outputs of —coupled to a Borg-Warner 4-speed manual transmission. The engines were completely ordered and manufactured in the United States; they were shipped to Italy where they were taken apart before they were eventually installed in the cars. This was similar to the manufacturing process of the IR 300. With a weight of less than , the car was able to attain a top speed of over .