I am running Crane 10510-16 For the solid rollers description (Long travel design for use with standard GM alignment bars in engines originally equipped with hydraulic roller lifters.) I used these because there is no reason IMO to use a vertical bar or add any additional parts to the valvetrain.
I am running the Gold Race 1.6 roller rockers with 7/16 studs. I did all the porting on the heads for the upgraded Manely Valve at 2.02 and 1.60 stainless with the valves having the additional +.100 in length to keep from having issues with clerance with the rockers. I am also running trend push rods. http://www.trendperform.com/
I ended up with pushrods that were .140 longer than the factory to get the roller alignment correct on the valve stem. Along with that I am running K-motion springs K-800 I believe these are good for .700 coil bind. There was also extra machine work changing the studs from 3/8 to 7/16 and pocket milling the spring pockets for the spring cups that provided positive alignment for instaled spring height.
383, Forged Crank , H-Beam Rods, Forged Wiesco Heavy Duty Flat Top Pistons, Lingenfelter Solid Roller Camshaft 236/244 .590/.590 w 1.6 rocker 112 CL, Crane Solid Roller Lifters, Crane Gold Race Roller Rockers 1.6, Manley Severe Duty 2.02 1.60 Stainless Valves +.100 Ported Heads and port matched intake. NOS Sportsman Direct Port Fogger System 240 HP Shot, Auburn Posi Pro, Motive 4.56 gears