Many times when mods like yours are made, people simply put the stock pushrod back in and let it go at that. Fact is, pushrod length IS the adjustable factor with pedestal mount rockers. So, when head gasket, heads, rockers, cam, lifters, valves are changed - or the heads are cut, block is cut, valve job is done - pushrod length should be MEASURED with an adjustable pushrod length checker. It is VERY common that slightly longer than stock pushrods are needed to put everything back like it should be with proper lifter preload. When this isn't done - a bit of noise is usually the symptom.
No way of knowing if that's your issue or not unless you pull the covers and go through the drill of checking pushrod length.
