The new Hemi is still in the crate. So far we've still been using the plastic mock up engine to locate placement & fit of all our components. We know the first hood we modified won't fit but we haven't gotten another one to replace it yet.
I'm pretty confident the radiator won't have clearance issues with the hood though because we've been using straight edges and tape measures to keep us at or below the height of our original clearances.
I'm hoping for a steel replacement hood so we don't have as much radio interference problems but Spence has toyed with the idea of going fiberglass. Chrysler moved antenna placement to the rear quarters on their fiberglass hooded TA Challengers and AAR Cudas to get rid of that issue. I moved my antenna to the rear quarter panel also on my '67 Barracuda after installing a 'glass hood. If he does choose fiberglass it will be easier to cut and modify though.