I've seen pics of those manifolds but I can't find any info on them. Are they still available and do you have a part number for it? I have a 4bbl Sniper to use on mine so I stay with fuel injection and I have the 6Hemi box on order.
They are hard to find now, and expensive as hell. I lucked out and got a takeoff from a crate 5.7 back when I was doing the swap years ago. If you can find one now they are about $1100! If I was doing a build now, I would probably go with this manifold;