^this. Needs to be on a dyno. No way in hell I'd trust someone else's canned tune on my car, if the chip would even work for your ECM. Like blownstang said, LMafs and SVT pumps vary a lot depending on the car. If you get it tuned, then are unhappy with the performance, you'd still have to buy the other parts and then pay for a re-tune. Plan out exactly what you want and build accordingly. Take your time if you need to.
What exactly is your goal for the car? A specific hp# or ET?
BTW, we have the same pump straight from Vortech if it matters. Also, his car wasn't even dyno tuned, he built his car around what the chip needed to perform correctly. Not sure if he just got lucky, but I don't have the money to get a dyno tune.
My goal is ~425 at the wheels. Then I'll start saving to get subframe connectors, springs, hood, window tint (just got new tails/headlights), and components for an engine build (have a spare 2v block).
However, I'm just a senior in high school so it's tough to get money while trying to get good grades and with athletics. Right now, I'm living off my money I got from working in the summer. It also helps to have a dad who owns his own shop and get's huge discounts from dealers/manufacturers.
BTW, I appreciate all the advice guys. I definitely can't afford to waste any money so keep it coming.