[blykins]

The extra lift is desired, but a 20 deg duration difference is huge. You also don't want a huge duration split because it increases overlap.

It would be best to contact an engine builder for the cam. Ive never had much faith in tech guys.

I can have Comp Cams custom grind any cam for me, with me picking the lobes. A solid roller with similar performance characteristics can be made, with adjustments for lash. Of course a solid roller would have the potential for more aggressive lobes and possibly more power.