Question about heads

Ok here goes, I think I did a stupid mistake, I got a set of j heads sometime back, I took out the valves and put new ones in, no machining or anything, it has always ticked lick a bad lifter no matter what I do, I have 273 adjustable rockers, i've tried new springs, 2 sets of pushrods, 2 sets of lifters, now all of a sudden I have bad spark knock at idle, do I need to pull these heads and have the valves redone at a machine shop ?