Cheapest ways to increase power

get yourself the super six setup (factory 2 bbl), free up the exhaust with a performance muffler like a cherry bomb or something (if you have more time than money, you can gasket match your manifolds to try to get them to flow a little better, add a windage tray, then if money allows get a performance erson cam and get the head machined for more compression and better flow. a set of rear end gears (3:23s or 3:55s) will really wake the car up too 3:91s would most likely be too much. you could always add header or a set of dutra duals to keep the factory choke. a clutch fan or electric fan will also free up a little power.