Hi- I'm enjoying following your thread silently!
I've never built a PRV, but as the same principles apply to any engine.
I would not use these. The cost of head gaskets, oil, the pain of pulling the engine etc states that putting these back would be a false economy (if you wish to keep this as your car- if you are an unscrupulous **** looking to make a fast buck then bang them back in and pass it on...).
Similarly the cams you show are not good to go back in- it wont be long before these get eaten through, taking the lifters with them and putting lovely hardened "sparkle" all round the rest of the motor.
Just my thoughts. And I am Scottish....
I also suffer with "Scope Creep" when doing these types of jobs. You have to draw the line somewhere, but wild cams alone will not improve your motor, just make you poorer with a lumpy idle, non-standard motor that doesn't run as well as standard. Tho I am sure you know this already!!
Keep going!
Andy