I like the non Hemi myself...
Seems the Hemi blocks split way too easy...
The non Hemi also comes with 27/25 valves, in stock form the RTC 6,8 and 9 heads flow better... In stock form!!!
You can use a clone cam in a non Hemi without issue...
The non Hemi cam is .004 larger in circumference... The factory service limits are well above this...
I like using a Honda crank, Hemi flat top piston and Honda 3.403 long Rod... Makes for .005-.008 pop up and use a .045 gasket...
Throw a dyno 308 cam in with 1.2 rockers, and dual springs feed it alky with a gx390 carb, and hold on...