Needing help putting a value on my V30 CC

[Chevy3+3]

I am contemplating selling my 88' V30 C+C dually. It is basically stock with its factory TBI 454/th400/205 combo. The transmission is slipping and will need overhauled. It is still drivable and cruises the highway fine. The body has no rust. The body has dings and scratches but overall still draws attention. The tires are all 70%. The interior is blue and the seat are not torn. All the PW/PL work.

What would be a realistic price to put on this truck if selling as is? And also what it's worth with all the parts I have for it?

I also have almost every major component purchased to do a complete NV4500 swap correctly including aa 94 model NV4500 with very lowmiles, a manual tilt column and pedal assembly to fit this truck. I also have a complete gray interior kit I removed from a suburban including trim pieces, door panels, dash, front bucket seats with console and seatbelts. I was going to swap everything to gray interior when I swapped the transmission in.

I absolutely love this truck. Not many unmolested trucks still out there. Especially with no rust. The only reason I am thinking about selling is because my priorities have changed at the moment. I will try and post a picture