Don't shoot me, but don't the millenium heads require a sheet metal intake? I don't know of any cast intakes that fit those, but I could be wrong.

I run the big runner Indy single 4 intake on my 605....I like it. Its fairly light, has huge runners, and fuel distribution is not bad at all.

The Indy Hemi tunnel ram suffers from a small plenum. A lot of people that do run them ad a big spacer to help. Even with efi on my old one, I did the same thing and it helped a bunch.

If I had your parts, I would build as many cubes as possible, and go with the RBRE rocker arms in a high ratio to help the cam. From there, compression is about all you have left to pick.