Basically, you are not going to have a very stretable,w/gas mileage combo w/the HP you are looking for.

The type of cam needed to make that power,can be streetable,but mileage will not be very good.

Using a Turbo should cover what you are looking for & still get OK mileage.

You will not make anywhere near the torque a turbo can give you.

With a turbo,it will make the power sooner & make it easier on your engine,as to a normally aspirated engine,you are going to have to rev it pretty high to make 300 HP.

Here is a super cheap $$$ I had given input on parts to use.
http://www.youtube.com/watch?v=xSB2uvlOOtQ
He probably spent $400 tops I think it was less.

You can buy a used stock turbo for a Buick GN or T-Type,or even a used Syclone or Typhoon turbo.
Typically a good used Syclone or Typhoon turbo will sell for 200-300 range.
Another option is buying a new import turbo off of Ebay,just an example http://cgi.ebay.com/ebaymotors/New-T3-T4...sQ5fAccessories

You can buy a used good turbo,100-250 range,fab up a "J" pipe from the stock exhaust manifold from weld El's from Mcmaster carr
Like schedule 40 tubing.
A plain jane Holley fuel regulator http://www.amazon.com/Holley-12-804-Fuel-Pressure-Regulator/dp/B00029JC6M & use a Holley 2 or 4 barrel carb.
If you want to run an intercooler, buy a universal intercooling pipe kit from Ebay just an example http://cgi.ebay.com/ebaymotors/CXRacing-...sQ5fAccessories

Buy one of these for a down pipe http://cgi.ebay.com/ebaymotors/3-45-180-...Q5fAccessories.

If you shop around & take a few tips from us here you can have a super low buck blow through turbo set-up on the cheap!


MBHD

12 port SDS EFI