converting to a Beckett Burner (oil boiler)

I have just given my 30 yr old Weil Mclain 5 section (p566) boiler an over haul and feel I would be better off replacing the W/M burner with a new Beckett. The boiler data plate states 1.65 gph. Beckett makes a few models.... AF, AFG, SR, SF, and maybe others.
My question is how do I decide which one and why?
Also does anyone have any experiance / comments on the Beckett fuel manager?
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