What will it take to get me and my mods in 300 HP?

You can see 300 hp with the ported cobra. AFR 165s or some TW's, a custom cam, and a 75+MM MAF(24#ers if you can afford it) would get you there I believe.

B18 head with a Skunk2 intake... oh wait this is a mustang site, still?

The cheapest route, I guess, would be some aftermarket heads and a tune. Or just dump a supercharger kit in there...

100-150 shot of n20 or a good set of heads and a cam w/24 lb. injectors as Grey5.0Beast said.

NOSSSSSSSSSSSSSSSSS!...........

ahem, let me:




NAAAAWWWWZZZZZZZ!!!!!!

that or wire a vtec controller into the computer or both, should plant ya about 1200 or so hp to the tires.

300 crank or to the tire? 300 crank is easy, to the tire is harder but not bad.

You will need some heads. AFR165 or TFS heads would be the best way to go. Port the lower on your cobra intake and get a TFS stage 1 for an off the shelf cam or a custom one. You should be able to get by on the 19lbs injectors but I do suggest some 24s. 70-75mm throttle body, a 190lph or more fuel pump and you should be good. This all depends on what condition your shortblock is too...
Kevin