2. You have to not have the 2150 gross weight increase.on the -140.

???

You sure about that? The Checkerbird's paperwork says it has a max
gross weight of 2150 when operated in the normal category, 1950 in the
utility category. It has both the original placard on the panel, plus
the AFM text stating that spins are an approved aerobatic manuever
when operated in the utility category with no aft baggage pax.

I'm far too chicken to try spinning it however. ;-)