I often think about this and believe I missed the boat. I've got $15k into building a very mild 512 and I'm happy with it, but keep coming back to forced induction. The 400B I picked up to serve as the base of the build I could have re-ringed and tossed a ProCharger onto cheaper than the stroker route. I don't do anything competitive, so it would be a sub 6k RPM build with moderate timing. Forced induction is an itch though that'll eventually get scratched though even if it has to be my upcoming brand X project.