Mopar R1 block

Trying to find someone that has some knowledge of the Mopar R1 race block?
Curious if they had inherent problems?
What can they usually bored to?
2 or 4 bolt main?
Would it make a decent block for a stroker build, with pretty decent heads, most likely some W5 heads I have. Possibly some W2 I have also.
I’ve stumbled on a lead on one, unused never run.
Thanks 12