I actually was talking to King Bearings yesterday after doing a fair amount of looking around. They're basically out of stock on SBM main bearings until October/November. You can find some of the 'lesser' stock type King bearings but none of the 'race' type....at least not in standard sizes. I could tell from the guy on the phone that the SBM market was not at the cusp of their interest.
This kinda confirms what a 'very famous' Mopar engine builder told me last week when I asked him about the use of SB Chevy rods (2.100" journal) in a SBM. He said it makes sense as the dimensions are very close and 'you hardly have any rod bearing choices anymore' for the SBM.
But more to the point, I think the Scat crank probably uses a radiused journal, so you need to be cognizant of that....regardless of journal clearance you also need to make sure you have the proper clearance at the radius.
