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JMHO but there are better cam choices than the 251; however, it that is the cam you have chosen, you need to build around the cam. The HTCC heads will need some work to be compatible so why not work your heads and save some money? Find a qualified head porter and tell him your plans, 103" motor built around SE251 cams; the porter will know what to do with the heads and where to set compression to work with those cams.
Point is, choose a cam first, then build around the cam.
Two suggestions, consider going to 3.932' bore for 107" motor and have crank trued, balanced and welded before install; at least trued and welded.
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