Chris, If you have acess to a digital camera, send some good pics and I'll tell you what is stock and what has been swapped. It's hard to tell as a 27 year old Jeep could have a lot done to it.
If your looking at your jeep head on, the pre 76 windshield is wider and it's sides are straight up and down compared to the ground or sides of the Jeep. The same view for a 76 on windshield has the sides leaning in as it nears the top. Yes, both lean back from the side view, but I'm talking about head on view. Ah yes, the pre 76 has the wiper motor on the outside of the frame under a cover (bulge) under the driver side glass. Yours should be like this. Your dash should have the key located on the dash, to the right of the column. The metal dash itself is interchangable up to the YJ. The difference in the models is how the whildshield stays up. Even the hinges are interchangeable as far as mounting them. Your windshield hinges should not have a place to mount doors on them , where as the 76 on hinge does, and the YJ then doesn't have mirror holes.
Back to the dash, the screw in knobs are located in different spots (by an inch or 2) than the clamp down style. If you have the WS frame with the wiper motor buldge, then you should have the dash with the clamp style hold downs. Is your speaker hole just cut out with a grill over it, or is the grill part of the dash panel? If you have the WS frame that tapers in toward the top ( plastic defrost vents), then you should have the screw in knobs, and later CJ dash. The WS frames and dashes work together as a pair. You can mix and match them, but it would be very hard and require drilling and modification.
Due to the floor board design of the pre 76, the post 75 seat brackets don't fit. Your kinda stuck using the tube rail system usless you want to fab something. If your going to a full cage, you can put in cross bars at the right location for the seat mounts.
1975 CJ-6 304 T15 Dana20 30/44 3.73
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2003 Inca Gold TJ Rubicon