More likely the wing saddle is not level. Put the fuse upside down, level the horizontal stabilizer, and then put a level on the wing saddle. If its not level, you can built up the low side with epoxy/microballoons, or possibly shave down the high side.

Is this view from the front of the model or from above the model? To me it looks like it's the view from above.

You can also check your wing root angles by placing one wing flat on the board and cutting a template of that root angle, then place other wing flat on board and compare root angle with the template.

so the measurements from wing tips to nose or tail are not equal by 1-1/2 inch ?. if so,...... it's just a simple matter of reshaping the wing seat on one side to get the wing to sit at right angle to the fuselage center line.
if the view drawn is looking at the front of the plane, then simply lower the high side of the wing seat until the wings sits horizontal.
the specific height of the wing is really not that critical, as far as flight is concerned, as long as it is reasonably where it designed to be.

So basically it's the view from above the plane. Wow! I'm not entirely sure I fully understand what's going on here. So if you could.........

Can you take some pictures and post them? A view like in your drawing and then a couple of close up shots of the wing/fuselage junction on both sides of the fuselage. Then maybe a couple of shots of the same spot on the fuselage with the wing off.

You mentioned the wing is a 2 piece. Is it a midwing plane? Where the wing panels plug into the sides? How do the wing panels mount to the fuselage? Just which warbird is it?

Saw a full size C-141 transport once with a wing like that. Took Lockheed close to a year to fix it.