Help evaluating this car...69 DART

This post references this car from a craigslist ad:
69 DART

Hi, I'm a newbie here and looking for help on what you guys think the value of this car would be as is and for ideas on building.

This is a 1969 Dart 6cyl that a little old lady literally owned. I looked at the car and there really isn't rust to speak of besides surface stuff than can be blasted away. Trying to decide if the car is worth working with.

The purpose for the car would be for drag racing.

POWERTRAIN:
Don't scream brand loyalty, but I have a 416 cid 13.5:1 LS3 engine that makes around 650rwhp and would mate it to a TH400, custom driveshaft to a rear end which would be undecided. I have reasonable fab skills, can weld, will be doing most of the work myself.
I have no problem w/a 440 (use to have one long ago in late 70s), but I would wonder what it might cost to build one today.

Q: Which rear end/susp setup would be good for this car? How far can you push these unibodies and /or are there stiffening pieces out there. would love to see pics of this

INTERIOR:
I'll try to restore the current dash or buy another, add 2 buckets and some black carpet all inside a full cage.

Q: Any good places to buy restoration parts for the MOPARS?

SUSPENSION:
Any suggested setups for steering and front suspension? This is NOT going to a roadcourse.

Last, is this car worth $2500? All I would get out of it is the body when I'm done stripping it.

Thanks for reading