When someone converts is there any determining factor on what minhagim (customs) they will take upon themselves in terms of Ashkanazim or Sephardim? Should it be dependent on the Beis Din they converted with? May they choose to do however they please (picking one or the other.) R' Ovadia Yosef Shlit"a has a Teshuva in ShuT Yachaveh Das Chelek 5 Siman 33 where he writes that someone who converts in Eretz Yisrael must take on the Minhagim of the Sephardim. Since he holds that Maran Beit Yosef the Machaber of the Shulchan Aruch is the "Morah D'Asra" in Eretz Yisrael and after someone converts they are considered to be like a baby that is just born. And since the person converted in Eretz Yisrael it's as if he was "born" in Eretz Yisael therefore he must take upon himself the minhag of the Sephardim. If there are more mareh makomos (sources) to this or savaras one way or the other please share!
(In both situations I'm asking, someone who converts outside of Eretz Yisrael and someone who converts in Eretz Yisrael.)