There is no simple answer to this question -- the "it all depends" is the only correct answer. For a small cubed motor like yours (239 plus an overbore), the 2x2 will be a better choice for all around usage. When you get to larger stroker motors, with port work done, big cams, etc -- the 3x2 will be much better in general. Most guys with smaller motors will be one heck of a lot better off with a simple 2x2 setup. They are FAR easier to tune and run than a progressive 3x2 setup. I used to run a 3x2 progressive on a 284 cube street motor -- was a pain in the butt keeping things setup correctly. Also, there was really no easy way to know that all three were in sync at any throttle position - as you couldn't run it like that in your driveway and measure anything.