The ring packages available for the stock 4.250 bore is some what limited but it is the same bore size as the 427 Chevy and 383 motors.
The stock 440 bore is 4,320 which is +.070 over 4.250 so ring packages should be good for your deal.
I've seen a lot of stock 426 blocks bored to 4.320 for NHRA SS back in the day and some even bigger on good blocks before Mopar started offering NHRA approved replacement blocks in the 1990s
Before deciding make sure and have it sonic tested by a good shop and go from there, I like to see at least .180 or more on both the major and minor thrust surfaces after boring honing
Some of the stock production blocks have a lot more than that stock(.330+) and some don't have as much as others