How Big can a 5.2 get?

Do a thorough google search about them before choosing what appears to be mainly a high volume reman company. EQ heads are an excellent choice but get them from a known reputable source that can finish them properly. Any good, trusted machine shop in your area can get the bare heads and do the finish machining, giving the best results. Also you won't gain much with 2.02" intake valves in EQ heads unless they get the proper bowl and port work to utilize that valve size.