Eddy head question

so I just got my eddy rpm heads and had a few questions for the guys that have ran them on there set up.
I was going through the instructions for the install procedures and they say that I need to use adjustable valvetrain for any cam over stock. How true is this? my cam is not much over stock, I dont remember the exact lift but it is for sure under .500. I think it was around .484.
and can I use my stock head bolts other than the one long one they supply? or do I have to absolutely use there head bolts?
and last they say to retorque the head bolts after it cools which normally isn't a big problem but I have doug headers on my 66 dart and with this whole head swap, unbolting the headers and working around them will probably be the hardest thing. so did you guys all retorque yours or were they good to go?
Thanks for any help. -Kory