Some new engines are called Big Cam IV are not cross flow engines - they look more like Big Cam III engines, with the Big Cam III look intercooler, but they do have new-type pulse manifolds of the IV. However, it appears not all Big Cam IV engines had all the new features. Electronic Injection Begun Pulse manifolds improved.

Cylinder heads modified, not interchangeable with earlier models. The features in this engine were: New intercooler introduced. CARQUEST works in close partnership with many major automotive suppliers and manufacturers and provides products that meet or exceed original-equipment (OE).

The CPL # 797 on the pump shows it as a Big Cam IV from about 1985 to 1989 or 1990 when the NTC14 came out I think.