Don't know if it's the same situation or not, but i have a set of raised runner Brodix heads on my 434" and when i tried to bolt on the injection unit the holes didn't even come close to fitting. I had to make 1/4" tk. block spacers to fit on each end of the block, and use .125 tk. gaskets. These are Brodix 10's rp's fp's, Brodix's answer to me was you need to run our manifold. Ya, right since i have perfectly good set of Hilborns i'm going to go to a 4 barrel, not likely. Anyway if you look closely you can see the gap between the bottom of the manifold and the top of the block, before i made the spacers. That was my solution, but don't know if it will work for you.
Zip.
