From memory, so it could be wrong, the 20R head will not accept an EFI intake. That is my direction for my own 22R. If turbo-truck's engine doesn't end up in Patch then I'll be converting to the stock EFI system that I bought off of 'Mud.
Define "mid to upper RPM"? This 22R of mine starts really wanting to pull at 3k and pulls up well past 4k though I rarely take it there. I'm not a big fan of reving something just for the sake of making high rpm HP without spending the time & money on re-engineering the bottom end parts. Within the stock redline these engines are pretty hard to kill. I would concentrate on making the desired power within that range.
I used to swerve around my hallucinations, now I drive right through them.