Take a look at the Ford 6.2. Single overhead cam, looks like Hemi valve layout except with a camshaft in the middle where the spark plugs are on the Hemi.
I drove one for 750 miles recently and it is a beautiful sounding engine which tachs right up to 5500rpm redline with no pushrod fuss. I know I will be sandblasted for this, but I just love the sound of that engine around 4000 rpm. Maybe if the rental company had had Dodges I'd be saying the same things about the Hemi, but regardless that 6.2 is a keeper. Slap one in where a 390 used to sit and it'd work wonders.

R.