SBF main bearings?

[pmrphil]

You might want to check the journal size on the rods - quite often the rods require a 2.100 bearing, common SBC bearings are too wide, they take a narrow 2.100 bearing such as 229CI GM v-6 - Clevite 1227P or H, or the Federal Mogul equivalent. Once in a while the stroker kits will come with the 2.000 rod journal also.