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I have something similar in an old 351 fms engine, except I am using afr185 heads, rpm air gap manifold, 750 holley ultra hp, and the cam that came with it was the wildest lettered cam they made, something similar to what blykins said. I think you'll be limited by the 170cc heads. i switched the 1.6 ratio rockers to some 1.7 for a little more lift also. I was told the 185 heads were good to 7g on the rpm for the 351 and I have revved it there with the hyd cam with no problem, but it is probably not making anymore power with the manifold, it did come with a vic jr but I switched it out. If you put in a lightweight flywheel and clutch that will help tremendously. I also have a 3550 tranny with the .68 od and 3.55 rear, no problems and really likes to cruise at 80. The drop from 4th to 5th is pretty good but you'll adapt.