Your manifold & carb selection is perfect, but now that your motor inhales better, it's got to exhale better. You really should do the headers at the same time.
Thanks! Since you brought it up, i was wondering if you know any certain set of headers that would work with the 225 slant six and the intake manifold i will be using? Please not to pricey, im just looking for function and something that would help it sound cool 8) But nothing too cheap, i am willing to pay whatever is needed.