Numerous 427's have been found with '6223 crankshafts. In fact, I believe all the Yenko & Copo cars used '6223 cranks in their '512 blocks as well.
As noted, the '6223 cranks used in those applications were cross-drilled & thfftrided.
The '7115 crank was an L-88 & ZL-1 oddity. I believe this was due primarily to the reciprocating weight of those huge piston domes. I have never
heard of a 396 being found this a '7115 crankshaft.
Colvin's book seems to indicate that 427's used a crankshaft with thicker counter-weights, however my findings don't substantiate this position.
The majority of this information ceoms from years of discussions with 427 owners.......