Iron 273 4 barrel manifolds

If you look on the NHRA Class Index page, it allows the 273 to use Edelbrock heads with a bump up of 5 to 10 HP. I didn't see anything on the LD4B in either the engine blueprint or index sections. The Chrysler part number for it is 2836139. I believe they came with and without the p/n cast into it.

The D/Dart can only run in Superstock now because only 50 cars were produced. Back then it was a D/S car.