Wow, thanks for all the useful info! I really appreciate it. I had no Idea there was such a dedicated following of these cars.
I feel like I should clarify that the only crack (that I know of) is on the water jacket just below the manifolds, you can sort of see it in the pictures-- the light brown line on the side. We are still debating whether to weld it or grind it down and use JB weld; I want to take as little of the engine apart as i have to, and as long as we do it right it shouldn't be noticeable from under the manifolds.
Based on what I can tell its a 132" wheelbase series 60 coupe, model 68 with the original black and maroon paint. Pretty Cool!
The engine is a different matter, from what I've seen engines were originally painted black or light green, this ones painted red for some reason, could this mean that its been out of the car before? And is there any way to tell if its the right 6-cylinder engine for the year (and maybe the original engine)? The only serial number i could find was on the drivers side of the engine: 228257-M-2.