OK well due to the engine number I'd say (unless it's been pieced together from more than one engine) that it is from a model 8 standard.As it has the muffler on the side it does and the engines back then did contain letters in the numbers.The later series of the model 5 did,but they didn't have the exhaust port that would take that muffler. The Sheerline did to but the muffler and carby where on the opposite sides to yours and they had a different style head.So that only leaves the model 8 as by the model 12 the engine numbers didn't contain any letters.
So since your doing all this fine work it might pay to find a model 8 base.They shouldn't be hard to find as they used that same base on quite a few models.
A model 8 looks like this.
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is there not suppose to be a gasket between the crankcase halves ?
No there was no gasket between the two halves.I guess they were such a awesome fit they didn't need it.I usually put some gasket paste between them just to make sure,but it may not need it there,but I'd suggest to anyway you don't really want to have to pull it apart if it had a small air leak from it.
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still bummed about the slight bend in the crankshaft.. will have to apply some heat and try bend back about a millimeter.
Wow if the crankshaft is bent I suggest getting another one,as if it's not spot on it could cause all sorts of problems.Some things like extra vibration,damage to seals & bearings and other things like that.Could do quite a bit of damage to itself.

Here for a good time,not a long time.