Pepe's is definitely on my "best ever" list. I went there a few times in the mid 1980s, and it really is amazing pizza. I gather the coal-fired oven has quite a lot to do with the flavor of the pizza.
If you really want to try to duplicate Pepe's pizza, you should enlist the help of Pete-zza, who is a real expert on the subject of duplicating a style. He will let you know that you have to do a great deal of research on your own before you actually try to duplicate the pizza. There is a long list of information you will need in order to get started. Things like what type of flour do they use, what kind of tomatoes, etc. It's kind of like private detective work. Anyway, best of luck and I hope you are successful in duplicating the fantastic pies from Frank Pepe's.