looking for a tune to start with
You can't put a tune on your car w/o a tuner software anyway, so you're going to have to buy one, and at that time you'll have access to the user loaded tunes.
Of if you have a friend with the software, he/she can let you look online for possible tunes.
I wouldn't download any of the tunes on those sites and run them. You should just use them for referance.
Personally I'd just send my PCM to somebody like Jessie at Wait4Me or one of the other mail order tuners on here and tell him the specs of your motor. It will cost you $75 plus $10 shipping, and it will e a good starting point, if you later decide to tweek the tune yourself.

