BDRCobra,
Like you, I didn't have a clear understanding of all the costs involved in building a Cobra. Even with a turn-key minus roller like a BDR, there's more than just the cost of an engine and the tranny. My base engine was 7295 and the TKO 600 was 1678. You can probably shave some cost off that with your engine/tranny combo, but all the other necessary bits and pieces can add up to $4000 plus. Check out the thread I started regarding what's needed for a BDR
HERE. Good luck!