for torque converters I would talk to Edge (Andre) or circle-d.
the "HEMI tick" is just that and we all live with it. on some vehicles it seems to go away once they warm up or at least it's a little more quiet. I have no idea if replace all the head components will make it go away but you'll want to replace all those items (and the pushrods) anyway with the type of cam you looking at.
chech out this link for some cam basics: