IMO: I would not put the Vic Jr's on your 302. Those heads are too big for your motor right now. I know this because I have them
but on a 347. I would go with the performer heads instead.
About the RR's and pistions... that is not true. I have a 347 short block from FMS and Crane Gold Series 1.6 RR's on my motor and I don't have any problems. Just about every company you run into says that this part works the best with their parts... They say this for two reasons, they benchmark their parts with their parts, and for marketing purposes.