Need all pulleys for 70 340 with aluminum pump, need radiator also...and brackets

Yes,the alum pump pulleys are deeper than the cast iron pulleys. It sounds like your pullys are mismatched. You can measure from where the pulley will rest on the pump & measure from there to where the groove is on crank pulley so you know how deep of a pulley to use. The ones I have listed all came from the same 70-up engine