371 build W/Big Mouth heads

The current plan for this engine is to re cam it and I am on the hunt for a Weiand X-celrator manifold part # 7545 or 7510. I'm hoping to send Tarzan to etiquette school and give it some manners with equal or superior power. Im not sure if this is really possible but am willing to try. This engine is just so good. This week I put Hedman truck headers on it which feature smaller primaries and a 3" collector as opposed to the dyno headers of 3.5" collector. As expected it added a boatload of torque under peak and sacrificed about 10HP at the top. So as it stands I have 28 dyno pulls on this including the 5 x 5 min break in cycles and it never makes less than 540 hp/475 tq. Really attached to this thing at this point. In addition to the cam and intake change I will also can the locked out timing curve and put a proper distributor in. Currently trying to upload a video of a test I did today to Youtube. J.Rob