I got them in a box disassembled. If I can get a pic that shows how they look assembled. Especially the shim and spacer location. That would be great. Thanks

The center assy in the pic. The arrows point to the thick spacers. there are no (thin) shims OE but if that is what you are referring to they can b added to get exact lateral arm/valve tip orientation

You can very easily assemble as installing. locating the spacers and rockers as they best center on the valve stem.

The rocker shafts you use with those rockers should have bananna grooves cut in them to keep the rockers lubed. You will also need non-stock pushrods if you want to run the adjustable rockers with hydraulic lifters.

Right - you can't run the 273 push rods with hydraulic lifters. The 273 solid lifter push rods are way too long and will bottom the lifter plunger out on a hydraulic lifter very possibly holding eh valve open.
I have used several times the push rods from summit for adjustable rockers and hydralic lifters. They worked fine.

thanks for the advise. It seems when I assemble them as seen in the pic. I have spaces between the rockers and the hold down washers. What keeps the rocker from mooving side to side?

The (5) bolt/holddown assy's: use the shorter ones on the (2) end(s) and the middle and the 2 longer ones in between