Bearings, ebay. They are all over. Cam, rod and mains. Rock auto also.
Pistons, sometimes ebay, sealed power and Edgge Machine. They can sell you rings also. Rock auto may also have them.
Gaskets sets are available new, rock auto,
Intake and exhaust gasket, your gasket set will have the stock type, a better version is sold by Rimflex.
Exhaust valve, use new 1 piece small block Chevy 1.5, same size. Intake, nos on eBay, rock auto.
Lifters, if running a hydraulic grind camshaft, kick the ebay bushes and obtain a nice set of gm nos lifters. 55-58 are different then 59-62 so make sure you get the correct lifter. Solid cam shaft, use solid lifters for a 56-62 261 chevy. Do not use the earlier style milk bottle shaped lifters with the solid sides. You need the later style.
Timing gears, use the aluminum/steel set for a 56-62 261 chevy. Don’t use the stock style fiber type cam gear, The aluminum is way more durable.
Rocker arms, the 55-58 are different then 59-62. If yours need rebuilding, Rocker Arms Unlimited in California is the best for rebuilding. They will rechrome and remachine the shaft and rebuild the arms and adjusters back to as new.
Push rods, the originals were solid and prone to bending. Aftermarket are tube type. Much stronger. Sealed power, trw. Rock auto has them.
Cam, your call. Stock grind, any of the cam grinders can regrind your core. Couple of others may be able to get you a new cam. Hotter cam, you probably want to limit duration to 264 degrees and lift to .450. A stock rebuild really can’t make use of any more cam.
Last edited by Dragsix; 05/02/2021 10:25 PM.