need help making an offer on a truck...

[67 cst swb]

Ok, I went and looked at a '71 Cheyenne 2wd longbox... Box sides need work, metal floor is very nice, wrecked front right fender & hood, he wants to keep the un-original 350 motor, will have Th350 still in it. Seat wasted, non-tilt, non-tach... Very dirty, like farm truck dirty... Factory leaf-spring rear Chevrolet long-box truck. The grille and grille surround are hammered as well as front bumper, but rad support is good (if not I have a good A/C support)... was running vehicle when parked 5-6 years ago... thats how complete it is, less the damage and dirt, did I say dirty...? very dirty.
Ok, here's the positives...
Rust Free factory AC cab, I do mean RUST FREE cab and doors, doors close like new... few AC pieces missing (center outlet (broke), hoses under hood gone, compressor gone). inner fenderwells are perfect, no rust. P/S, P/B complete... let's see... interior would need total replacement...
I'm telling ya... replace front right fender and hood, repair boxsides, new front windshield and cab rubber and interior,... as well as serious cleaning and basics, i.e... brakes looked at, etc... were talking great rust free start...

So, what should I offer him...$$$...?

I was thinking about a future project of: convert to shortbox (have short-wide box already), serious cleaning, put a motor back in it, I have a good/usable fender & hood... and have a great '71 Shortwide starting point for future rebuild... But, I don't really need another project right now...