4.05+ stroke have clearance issues , mostly the last oil drain back on the passenger side of the block, the passage that connects the last 2 drain backs together there is just enough thickness for the notch that is needed for the 4.05 crank the 4.08 gets hairy and 4.20-4.30 there is not enough casting to notch it and not break thru to the passage ,
3, options here, 1st is to block the last drain back at the head, 2nd is to tap off the last one on the outside of the block and route to the oil pan and plug the drain back internally , 3rd is the best solution(in my opinion) is to clearance the passage then tube the passage and dimple it......not to forget the windage tray it also needs some attention for the 4.05+ cranks.

CP has a 4.20 inch crank, less issues......Now if your real adventurous, offset the 4.25 to 4.3 with 1.88 Journal ......... it's like trying to fit 64 Imperial into a 1 car garage.
The 9.25 deck height of the 5.7/6.1s make the 4.20+ cranks a challenge the 9.28 Deck height of the BGE(SRT392) gives you better option.