Should I sell my chevelle?

[socalfandabodys]

Well I am 18 and just spent the last 4 years building a 68 chevelle with my Dad and Brother. I am leaving for basic training in a few months and have a 6 year enlistment with the army as a black hawk helicopter crew chief (basically a mechanic). I drove the chevelle to the gas station today and a Korean Guy in his 40's asked me if it was for sale. He was driving a brand new 745 bmw. I told him I really didnt want to sell it as I have only put 1500 miles on the frame off resto. He told me he wanted the car and offered me $30,000 on the spot. I have $23,000 invested but, all labor was done by us at home. So my question is do I tell the guy to come look at all the pictures and receipts and go for a ride in the car. Then tell him I want $40,000? It really kills me to sell her but, it isnt going to get much use in 6 years. You can see pics under socalfandabodys in the vbgarage. I know the car may not be worth $40,000 market value but to me it is. heres some specs.
Frame off resto
sandblasted chassis
polyurethane bushing everywhere
all control arms and chassis boxed
eaton posi with 3.31 gears
disc brakes in front from ssbc
eibach springs with hotckis sway bars
new gas tank
new gas and brake lines
powder coated inner fenders and core support,shaved firewall,custom dash,custom console,custom leather and suede interior,all new glass,custom electric seats,mercedes carpet
tilt floor shift column,17 edelbrock wheels
too much to list on the engine and trans
402 ketih black pistons comp cam,edelbrock heads,2004r overdrive tans by bow tie overdrive,serpentine system etc.
check out the link. by the way some more stuff has been done since these pics like the interior. I forgot to add the body is flawless and so is the paint.