dang. Nice price for that engine. If it's standard bore especially. The block alone would be worth somewhere around there.... good job!
Thats my F427, nice lil unit.
The reason I asked about gearing was 4.10's sure can make a softer motor feel ballsy. I had a truck with 2.73 gears and it was interesting :P
On another note, if the guy isn't hurting for money, why not stroke the 390 to 445? (it'd be under $2000) I'm pretty sure that would get his low end torque fix without any problems.