I know its a dead horse by now, not that it's ever stopped me before
There is a very good reason why you label everything, in this case its too late for that, i'm not going to chastise you as it won't fix anything.
However, you will be fine in the short/medium run you'll be fine just putting them back on there any old way. It'll be fine for awhile, you'll just want to run the cheapest conventional oil possible and change it after a couple thousand miles as there is going to be a lot of tiny almost visible metal shavings from the pieces wearing down all the high spots from mismatched parts.
In the long run you'll run into increased wear on all the parts of the valvetrain. The pieces wear together to provide the most contact possible between parts, this results in valve train stress being evenly distributed over the most area, mismatching parts can result in high spots between parts. If those high spots aren't broken off rather quickly, it will cause a lot of stress on the corresponding parts, the rocker arms won't care, but valve stems and pushrods will. Worst case, the metal chips and you have what is essentially a chisel working away on your rockers, valves, pushrods or lifters. Over 40K miles the damage can be quite visible. In diesels it can result in broken parts as soon as 10K miles after assembly. Diesels have much more stress on the valvetrain than gas engines, but the damage is still done, just over a longer time. If you're lucky everything will be fine for the rest of the life of the truck, if not, worst case, you'll be replacing pistons and heads, cams and lifters.
