But I've got lots more questions

. I've got a truck with the 302, and a few things about this motor are it has a lousy cam and it's speed density. What could be the cheap cheapest way to convert to mass air on this thing? I want to convert to mass air because I also want to replace the cam with a hydraulic roller cam, like the B303 from ford racing.
My second question is how much of the valve train will I need to replace when going with this cam? It is 224 intake/exhaust duration and .480 int/ex lift @ .050". I was running it on dyno 2000 and just the cam in the stock motor with small-tube headers and mufflers it produced over 100 horsepower. I went from 180 to about 290. Do these sound like realistic results? I don't know how many of you have used dyno 2000 before, but it seems pretty close--whenever I enter in manufacturers combinations the numbers always closely resemble their dyno results. If this is true then it certainly seems like a cam swap should be the first thing I do!