I love the PPG dogbox. I was one of the 1st buyers, and it was nearly half the cost of what it is now.
I had thought about doing the base's 4.3FD, but I'm glad I kept the EP's 4.7FD. It works well with my setup. You will make more tq, so the 4.3 may work well for you.
I did run a couple years back. Race gas tune, M&H 7.5x23-15, full interior...a lame 12.1 @125. A couple things to mention about that 1. I don't have enough seat time at the track which means I suck at launching 2. I kept on hitting a lean cut in 1st gear(I should have put it on open loop and raise hell), so a hiccup in 1st pretty much kills a drag race. With good driving and a clean run, low 11s should be possible and perfect conditions may yield a 10.99999 LOL
There's a brand new set of M&H 8.5x24.5-15 in the garage, and I haven't made it back out to the track. Our closest 1/4 is 2hrs away. If I break down, I'm screwed.