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I may save the 2315's for another build since they were basically given to me (not free but cheap).

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Oh that's the story of my life as I have parts (new and used) in every room ex the bathroom. yes you'll use em (one of these days ). What I'm doing w my 451 & which would b my suggestion is to go w the right KB's & mockup the short block & see what you actually have (deck and quench plateau height) & in conjunction w what is avail for gaskets machine for quench and the right CR for your app w your intended octane/cam (though I am not sure what CR to shoot for) then dissassemble/machine/reassemble/recheck/dissassemble and balance it/reassemble . This'll give you a long block that will not need to be touched and you can then play/experiment w the external additions and know that your foundation is perfect