How to free up my 440

So which engine block should I use for a build? I have a few to choose from:

1) C440 67 block 6-20-66 date code. Bare with caps and reground crank. Has light surface rust but was cleaned up.

2) G440 71 short block out of a Challenger I'm told.

3) J440 73 RV/truck short block 3-2-73 date code

4) 6T440 76 block and caps 2-5-76 date code slight damage bottom of one cylinder from rod failure

5) 7T440 77 block and caps

I'm planning on a .484 Purple shaft cam, Edelbrock Performer RPM, Edelbrock 1409 750cfm, 727, tti headers and Flowmasters over the rear axle, 8 3/4 3.23's. Going in a 67 Dart.