help figuring out what 6.0/80e 4wd 2001 1500 is worth

ok so im trying to figure out what a good price to list my truck for sale would be but i dont know where to start.. its a 2001 silverado 1500 4x4 std cab long bed..its a base work truck with manual everything, everything works a/c heat etc 270,000 on body.. mechanically its great, has a slight shake at 70-75mph, passenger side bed is kinda beat up, and seats have tears on corners from climbing in and out, normal rust under rocker on both sides.. it was a construction truck until 250k when i bought it

heres the mods

100k mile drivetrain from 00 silverado 2500hd which includes 6.0/4l80e/transfercase
2010 suburban wheels with decent tread left
new rotors& pads all around at 255k
new monroe shocks at 255k
New moog lower control arms with ball joints and bushings
new moog upped control arms with ball joints and bushings
new moog idel arm
new moog pitman arm
new moog idel arm bracket
new moog inner & outter tie rod ends
new rough country tie rod hd braces
new skf front wheel bearings
front diff out of 04 with 150k
cats removed
factory 4.10 gears with rear locker
new oem tranny cooler setup

im stumped, i know ive seen t case areage 350 around here, 4l80e roudn 800-1000, and engines 700-1000, i just put 1000 in the front end less than 500 miles ago.. any thoughts