Engine/Tranny Value

[dj3]

Kicking the idea around of dumping my current BBc setup and going with an LS engine. Would like to hear some opinions on what it would go for to see what kind of hit to expect. Here is the setup to be gone

World Products World Class 540 BBC 600HP/600TQ with March Front runner (No Ac)
Coated Super Comp Headers
TKO 600 w/3" Aluminum Driveshaft
I would also ditch the stock front subframe and fuel system.

1500 miles on engine and trans.

What do you think it would fetch in this economy?