Well that's good.
No visible fractures on lower pan either. At least from the picture. Kinda crusty on the bottom side of that upper oil pan.
I'd cleanup the lower pan, slap it back on and give that engine a serious Sea-Foam treatment or two. You should be ready to go then.
before you button the top end(s) up post pic, best possible of cams and chain relationship, a good pic will tell all the viewers if 16 links is confirmed. I am sure you have seen the Ross-Tech illustration as well. Looking real good !!!! Real Good !!
Ok, how do you get the cams to sit in the head properly? How do you install a cam? The cam followers push up on the cam so it can’t sit properly. Do you have to push down on the cam to push in the followers? Cam you use the bearing caps to ‘pull’ the cam into its seat?
I usually use the "cam caps" to draw the camshaft down. But...
You have to work your way back and forth on the camshaft so you don't bend it.
With all of the screws finger tight, start at one end of the camshaft, working towards the other end, turn all of the screw like 2 turns. Repeat process until camshaft is fully seated.
Before you go any further. Make sure you've got some lithium grease or at the very least copious amounts of clean engine oil around all the cam bearing journals.