68 4-door Biscayne L72 on eBay
 

https://www.ebay.com/itm/13698762316...=10001&mkevt=1

Real?? If so, oh my goodness!

Could you get full gauges in a 4-door full size Chevy in 68 ?

3915084 on the transmission part number tag is a number that I have not seen on any published Muncie lists. Skimpy ad text does not say whether it is an M20 or an M21. Axle stamp indicates 3.73 posi rear, so if both are original then whichever ratio it is it is the version with the internal speedo drive gear for a 3.55-4.88 rear.

I have seen 3915085 which is a 68 M21 (not sure which internal speedo gear it has - for 3.55-4.88, or for 3.07-3.31).

I think that compass on the windshield is worth a few bucks too.

Selling dealer was in Kansas, IL?

I threw a bid on it…way cool

Nothing different about that equipment from a 2 door Biscayne, so sure any of it was interchangeable. Was it available in '68 ? I wouldn't doubt it, if the dealer knew the correct boxes to check off.
Someone needs to get Chad D to look at it and respond. I'll send the link the Derek to forward to him.

Kansas, IL is about an hour SE of Champaign, IL.

Looks like the dealership decal is "Bough" Chevrolet?

Tach even has the correct red line for an L72. If this is real, this is really cool.

Is that air cleaner correct? Thought it would be a dual snorkle.

Snorkel air cleaners that came on most anything with a 4 barrel carb in the 60's got tossed early for an open element cleaner.