The pushrods DO care. Valve lash on a 470 is set by pushrod length. Lay out all the pushrods side by side. If they are all the same length THEN they don’t care. If some are different length then you need to measure the valve lash (Merc manual #8). Your local Ford dealer may be able to help, as the Ford 460 uses the same pushrods. I don’t think the rockers care.