Well... I have a VERY well sorted FD chasis (approx $60k in mods/upgrades over the past 6 years) that would suite your needs PERFECTLY.
Unfortunately there isn't a chance in hell I'd sell it for what you're likely looking to spend, ESPECIALLY since you just plan on throwing an LS1 in there...
Now, don't get me wrong, I've got nothing personal against doing engine swaps, however I *do* have too much time, effort, love, hate, and care invested into my own car to watch it leave to become something it wasn't meant to be.
I think that you'll find many owners will feel the same way. I'd rather rebuild my engine every other year than get rid of the car I've put such thought and effort into.
What you REALLY want to buy is a roller shell that you can make your own, you can't afford what it would cost to buy out the emotional debt that many owners have sunk into their passion.
A roller is a roller, stripped of it's good and waiting for a new life. They are "cheap" by comparison. No owner in their right mind is going to sell you years of their passion so that it can be turned into something they didn't envision from the start.
Best wishes in finding a nice ROLLER to start with though
