if I could get a reliable 400 hp out of her that would be fine by me because that should be enough to get to that 60mph im looking for. Ive already been told ditch the b3for a b1 and i will prob be close... but i like my b3 lol the ability to roll on the throttle and the way she handles the chop and low speeds is really a good thing. I just dont like getting passed by the little bayliners with a 4.3

would i see any mph difference from say a better manifold, port matching my heads, glm alum exhaust, roller rockers, and a more free flowing spark arrestor?