Your class allows headers. I have tested this on the dyno and they are 25 hp better than the best ported manifolds on the open chevy motors (the chevy version of your motor). Imca has already approved the use of these headers on a mopar. I sent you a link on that. On my stock car with the eq magnum heads I use a chevy header with a magnum flange. I just cut the chevy flange off and weld on the mopar EQ flange. The EQ magnum head has the center two exhaust ports spaced farther apart than LA heads an shaped rounder than factory magnum and LA heads . Schoenfeld headers makes a flange to fit. It's in their catalog. In your class you don't have to run a stock steering column or in the stock location. You can put it where ever you want with 3/4" tubing and ujoints. You will be the only car on the track running manifolds.