If you feel you have room to torque the head bolts correctly, I would say you can do the whole job in chassis.
Our cars over here are a little more cramped, and torquing head bolts is a pain.
I would replace the camshaft, lifters, lifter guides, head gaskets, head bolts as a must, the usual sundry stuff.
I would also replace the oil pump, because of the regulator valve wearing and sticking open like they do.
Then they have no oil pressure.
If you are doing it yourself, I would keep the AFM function, BUT you must fit everything where it is meant to go, no ifs, buts, or maybes.
The lifter guides are different front to back.
Hope this helps.