I've done several from completely converting old Hilborns to buying new stack manifolds. The FAST XFI system works great with them.
I have several pictures of engines with stack injection on my web site under the Photos page ( you have to scroll down a little). www.fastmanefi.com
A word of caution: you have to run sequential injection with a stack system in order to control the idle. There's not enough manifold volume for an untimed injection pulse. With bank-to-bank you get "pop back" through the plates.
