You can spend $2000.00,on a catback.

 

300 rwhp out of an N/A setup is going to look something like this:
AEM EMS UEGO $1400-$1700
Individual Throttle Bodies $2200-$3600
Spoon/Cometic etc. head gasket $200-250
Toda, skunk2, crower, spoon, or other, stage 3 cams $600-$2000
Double coil chrome silicone valve springs, titanium retainers, cam gears, and other valvetrain do-dads $500-$1500
Inline 2.5 liter stroker kit (or equivalent) $4600 + core
440cc/min injectors or better $no clue
"insert name brand" large primary header $900-$1500
"insert name brand" 70mm single exhaust $1000 or so
"insert name brand" lightweight flywheel/clutch combo $1000
lightweight pulleys $320
lightweight wheels and brakes $3500 (spoon SW388's and Wilwood dynalights are about the lightest)
higher compression pistons $unknown
a REALLY F'ING GOOD TUNER $1000 at the very least
a decent helping of good luck,
and after all this, it's more than likely that your goal is absolutely unatainable on pump gas. Good luck, let us know when you get it all done