14" rim.....what size tire will work best

If your rims are 6 inch, BF Goodrich radial T/A P225 60 R14 or P215 60 R14 will work, if your working with 5 1/2" then the P215's are probably the better option. If you want a taller side wall go to 70 series, just make sure you have the front wheel well clearance.