i need your best guess.....

[fiveohpatrol]

You won't be able to get 300 hp to the wheels with the stock heads, unless god himself ported them. You will however be able to get close to 300 at the motor.

Your gonna need an extensive head port job, with larger valves and you'll probably want to shave the heads some too to bring up the compression a little.

You already have a great intake for the power level your looking for. But you'll need a cam to get there. Basically anything BUT the motorsport cams, I'd go with the trick flow stage 1 cam. But with that you'll probably need to ditch the 1.7's for 1.6's.

You didn't mention underdrive pulleys. If you have a good alternator, they are a great way to add cheap hp.

hope this helps