Small update;
Found a RAVE valve on ebay for like $35 shipped, so thats on the way. Got an OEM intake from RIDE-RED-250R (Thanks again man) that I'm sizing up. I've been pretty tied up the past 2 weeks and have'nt gotten to do much more on this. I was going to initially hold off on buying the crank/rod/piston stuff but I'm reconsidering that and thinking about going ahead and getting that stuff to see how things are going to need to be setup before I do a whole lot more work on it as far as coolant lines, intake, exhaust, etc. It all looks do-able, just going to take some thought and planning on it. The exhaust flange is going to need to have a little angle on it from the looks of things to make it under the wish-bone area.
I'm a little bit concerned that my machining may not have left me with a surface exactly parallel to the crankshaft (Although I feel like I did a pretty good job of it) I'd hate to do everything else and find out that I had goobered up there on the most important part. I had an idea to basically assemble the thing without a cylinder head, and hook it up to a small electric motor and see how it wore (if any) for a little bit before I went much further on it, which might be a good idea considering all the welding/potential warping and such that has been done to this thing.
So I guess right now, that is the direction I'm leaning, I will go ahead and get an 82mm FL350 piston ordered, possibly use a stock crank to try things out before I get the +4mm and stuff.