Looking to buy/build 500-600 fwhp 360

Probably only need a 100hp shot to what you already got. Why not see what the best time you can get out of the combo you already have before trying to drastically $$$$ improve it.

How much horsepower do you think I have? 360 with high-performance cam, improved springs on the valvetrain, and headers? I'm guessing 350 hp?