Help Identifying this CB750

[eclivic]

I recently purchased this 750 from a friend to help out his father in some hard time. I decided to keep it and turn it into a slow fun project. Comparing this bike to the many other CB750s I see, I am completely lost. I dont know what is what and if any parts are original or aftermarket, all the way down to the headlights having a cat on them and 2 of them. Any help would be appreciated to know where to start.

 

[dirtdigger]

Just a bunch of aftermarket parts. frame serial # and engine serial # needed to tell you what year frame and engine are.

 

[eclivic]

Engine cb750e1099365
Frame cb7501098984
If that helps at all
I assume its a K1

 

[dirtdigger]

Yes it is a k1

 

[original k1 old fart]

Yes it's a mid to late model 1971 k1