well if you've already bought hardened pushrods and guideplates, you might as well get the roller rockers, they're a neccisary when using a high lift cam... now on to the cam, summit cams, lifters, and such are great parts... go ahead and use them... but first call up crane or comp cams, tell them what you're trying to build, how much HP you want to try and get, how many RPMs you're looking to max at, and they'll give you the stats you need on your cam to do what you're doing.... now go thru summits cams for your engine, and find one closest to that... now the thing is, since you already bought your carb and such, you're going to be limited on your cam, cause you dont want something that needs higher CFM than what your carb can provide, you also dont want to get something that needs a lot less... its all difficult... now theres going to be an issue with your pistons, if you get too high lift of a cam, your pistons need to be reccesed properly for the valves.... then you're going to need to think about your heads/intake will they breathe well enough for all this other thats happening? or are they going to not allow all that power you're looking for? also your crank, you say that it seems fine... i'd still take it in and have it polished, shouldn't cost too much since you're not having it cut, also replace your bearings while you're at it... how do your rods look? you should probably have them checked to see how straight they are, if you're planning on pushing high HP/RPMs you dont want to have a rod that has any damage at all to it... or else you'll be paying a lot more than you planned... hopefully i've been of some help so this rambling doesn't goto waste..