Does this help?
 
 
 
 
 

Yes, I agree with SRTsFZ6. The carburetor is backwards, and yes, the splines would go into the intake manifold.

I can see an imprint of the "splines" on the black manifold mount holes, but those small nuts do not seem to adjust on their bolts, and short of using a hammer, I'm not sure how to get the splines or the tiny nuts on the bolts to fit back into the manifold. I will try to get more photos.

I can't say if the previous owner made changes, but the carburetor was definitely old and used, and everything
Fit together just fine before I removed these three pieces from the engine.

And thank you for the tips!

SRTsFZ6
Does that splined part come off (threaded spline) spin off of the bolt?
 
If so, I believe that spline SHOULD be embedded in the intake manifold (acting as a nut for the long bolts).
Obviously on the side leaving the carb to manifold spot air tight..
 
If not, please separate the manifolds, bolts, splines, etc so we can figure out what goes where...
 
No, I've not been able to get the small nuts or splines on the bolts to move.

I noticed yesterday the carb was reversed, but the length of the bolts don't reach both ends with the manifold ends in place. I only took off a nut from each bolt when I removed them, so I just have to find a way to force the splines back inside the manifold mounts

 
 
.
 
.

I have photos but they just keep loading and not posting.

. The mounting bolt (splines/flange and the attached small nuts are fixed onto this bolt)
And the entire assembly with the engine bolts I put in on the left to go onto the engine.

I kept all the parts together in a box, so just the nuts are for the opposite ends of the bolts I guess?

Go to "Post image", which is free, open an account and up load your pictures:
 
https://postimg 
 
Use the "hotlink for forums" to copy, paste here, and it'll show as a large pic.
 
Please post all your parts end to end so we can figure out what goes where...
 
 
.

IE:
 
 
 
 
 
 
 
 

Thanks man! That helps. I copied hotlink to forum and will try to paste the link below.

I encouraged the bolts through the manifold mount with a hammer
for about an hour, with the help of some 3-in-1 oil, so now the bolts
Are now flush with the flange/rim area, but still not extending outside
Of the opposite end of the carburetor.

I used pliers and an adjustable wrench to see if I could move the small
Nuts on the bolts up further to give them more length, but no luck.

So as of now, the bolt end is ALMOST out the other side, and they are
Sticking out about an inch on the left side.

Link attempt with parts..

I click the "hotline for forums" icon to the right

It says copied.

I see either a url option or https option to paste.

I pasted 4 photos, but when I click submit or save changes, they vanish and are no longer inside
My reply post.

Hyperlink for forum attempt 3

One hour hammer results with 80% bolt target depth

3in1 oil utilitzed with hammer to encourage flange/ridged grooves into manifold/intake
Bolt holes.

Bolts are about 1cm from the exit port on the opposite carb end.

Bolts protrude about 1 inch from their point of entry on left side of carburetor.
(Photo of parts before hammer bolt assistance also included)