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All those look to be for standard bore and standard crank size, both of which I doubt you'll be able to use. If your rebuilding your block its going to need boring, probably .030 over. Your crank might be ok but that's something you won't know until you check it out. Your best bet will probably be to let the machine shop get your rebuild kit for you. At least wait till they check everything to order, summit can have that to you in one day I'm sure.
I mentioned a vortec since your already buying an intake. Just use the special manifold and a new timing cover (or put a sensor in the stock cover to full the hole) then you treat it just like a tbi, you just get to enjoy better heads and a roller can.
Well after thinking about it over the weekend I am wondering if I really want to drop $3000 or so on a new motor and stuff...
So I'm thinking my first step right now is to determine if the rear main seal is leaking or not. If it isn't, and the oil leak is indeed the manifold, I'll probably just get a new (used) intake, have the intake gaskets re-done, have a new knock sensor and pigtail put in, put shorty headers on it, and be done with it (well along with all the other sensors I am replacing too). Oh and get the A/C recharged haha.
The rear main seal is an easy fix. Takes maybe 2.5 hours if you've never done it before. You're also probably better off with a parts-yard intake for $25 instead of spending all that money on an aftermarket unit that won't help any.