Moving on to the cylinder heads -after taking a bunch of measurements and some quick mock-ups it looks like cracked Magnum heads will be employed with G3 Hemi valves, springs and locks.
It sounds to me you are putting the emphasis on "cracked Magnum heads will be used".
Now almost everybody else will just dispose of them (baah, they're cracked...), but you seem to have a recipe up your sleeve to use them anyway...
Interested.