I just rebuilt my block (89) this past spring and used Clevite 77 bearings. I can't remember the exact part number, but they were an excellent fit and were of great quality.
For piston rings, I believe I did use Sealed Power and also used a Mellings Stock oil pump.
The total price, including all gaskets, worked out a little more than the summit kit.
Hope that helps.
89 LX - 465 rwhp/488 ft/lbs - KB 2.1 Flowzilla @ 13psi, GT40 lower, MSD dizzy, coil & ignition, 90 LMAF - 42# injectors - 75mm TB, TFS TW Heads, TFS Stage 1 Cam, Stage 2 Snow Meth kit dual nozzle, GMS K-member, arms and front coilovers, Alum. DS, , Steeda Alum U&L arms, U&L Battle Boxes, MM CC Plates - Bumpsteer & F/L SFC's, Steeda Adj. R. Swaybar, FRPP 3.73's, front control arm bushings, Earls SS brake lines, Lincoln Calipers, SSBC rear disk kit, Steeda triax, cables and adjuster