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

Is there a difference between early and late SB Mopar pulleys? I have an early 340 engine with aluminum water pump and the billet pulley set I bought off E bay doesn't align correctly. The crank pulley needs to be about 1/4 inch further out or water pump pulley closer in. I checked them on a 273 I have and they were off on it also.
TIA