It will cost more, but in the long run, these would be much better options:

360 Magnum with stock Eddy heads, small .520 cam, inexpensive 76 mm turbo, 3:55 gear, 2,500 stall, aftermarket fuel injection. You will have to purposely try not to run 10's.

OR

6.2 Hemi w/8 speed conversion, 3:55 gears