What leaf springs ?

need new leaf springs for my 71 Swinger, I'm thinking ESPO springs are a popular choice here.
1. I will be running 245/60/15 (now I have a 245/60/14). Not a fan of "*** in the air" so any ideas on stock height vs. ?

2.does anyone have a pt #


Did you find a place in Canada that has them? With the exchange/shipping now a set of springs cost $1000 by the time you get them here...I'm not cheap but ..