318 Carter BBD 2bbl Replacement Question

HemiMark - found it on Ebay. Brand new - looks almost identical to the original. I think it's closer to a 67-72 Carter BBD replacement, because it doesn't have 2 emission related vacuum connections that my original one did. I just capped those off. Unbelievable performance difference from the original. I took it out Sunday for a spin and got rubber flooring it from a stop - has 2.45 gears in a 8.25 rear. it's never done that before!