I might be wrong, but he's probably talking about side clearance. Yes there should be some side clearance... maybe .010 or so.
This setup uses the Oiling line kit from Indy them? Have they been restricted already?

[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]