No, the rad won't fit between the rails - the fan is another reason it  can't lower. The pulley that the fan is on is right where it is in this mockup.

As for the grill...going for something like this:

or this

[ATTACH=full]41950[/ATTACH]

Gonna grab some pics of this mockup, but with the full engine mockup. It is actually larger/taller than just this block.

---although adam, you might have an idea there. I could use the rad off of another car...with an electric fan and just tuck it in there. Mechanically I might need the large radiator, but not sure. I'd love to just put the big honkin fan on the front of this cat engine though...for looks. deadly.