That's a lot of money for a truck that you can't drive and check out. I usually only buy trucks like that for the parts because you are sure to find far more problems than you think when you do get into it. So, something closer to $500 would be what I would normally be willing to pay.
Having said that, a newly re-manufactured 460 is worth about the $3000 asking price - if it was done by a reputable builder and has a warranty. So, it has potential.
Gary, AKA "Gary fellow":
Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI