Ok, Ill bite. I hate the "how much will I make" question, but here goes.... 300 is possible, but there are a lot of variables. You might make 300+ or less than 300, I have seen it go both ways. I expected to make 700+, I made 666. That was on a mustang dyno, a month later it put down 718 on a dynojet.
Here are some things you need to ask....what cam do I want....will it hit my pistons? Check with Modular Head Shop, there you can get all the head/cam info you will ever need.
The PI intake is good for now with what you are doing. If you start trying to go with a bigger cam, a forged lower to spin the crap out of it, then sure, there are some better intakes out there.