Do you want oil pressure to your rods full time or not? I do , I use the ruck narrow full groove main bearings, not the wide full groove race bearings
Oil does two things in our motors, lubricate and cool, I like cool cranks
Are those the same as the MS-1277HG Clevite 77's?
I can't answer that sorry. I use to use the Seal Power part number M4500 for the RB motors and their M4400 for the B motors, I think they discontinued the M 4400 several years back I prefer to build the 400 blocks over the 440 blocks due to the thicker main webbing
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
, I use the ruck narrow full groove main bearings, not the wide full groove race bearings 
