325/50s on15x8s ?

I was told I needed at least 10 rims. I also intend to install 325-50-15 on my 68 dart.I have 15x8 draglites with 275-60-15 and was told 325-50-15 would bulge to much on the sides and there would be less of a footprint to the ground. I believe they said there was a danger of the bead letting loose when corning with a tire that wide on a narrow rim. I'm not telling u it cant be done, I am just passing on the info I received. I hope this helps.