Rebuilding my KR-2

Still getting to know my airplane. It's dimensions are not the same as
either the KR-2 or the 2S. Still figuring out how I'm going to weigh the
thing. Probably stack the parts on two or three scales then weigh the
engine. I'll come up short of what the cowling would weigh since it was
junky, sheet aluminum scabbed together and modified a couple of times.

To the point. The following is what I presently do know.
1) 16'2" long from prop bolt to back of rudder.
2) 21"7" from wingtip to wingtip. Tips are rounded and cut at an angle
inward from top to bottom about 5".
3) Horizontal stabilizer 5'11" tip to tip.
4) Vertical stabilizer 3'9" from bottom of fuselage to top of tail.
5) Schaumburg carburetor with number on the throat NAS3A1
6) Dual Case mags (one cracked cover). Plug wires bad.
7) Continental 4cyl. engine with casting # 6651 / 9546 and 6652 / 112546;
cyl. head cast # 6620.

I was told there are 25 hours flight time in current configuration. Since
the logs aren't clear and the builder is reportedly dead the information is
suspect, though the plane did look like it had been flown before I
dismantled it.

More to the point. Will the engine casting numbers tell me what kind of
engine I have? It just this second occurs to me that I can take my photos
to the local A&P and ask.

Forrest