Bought new rims, have some tire size questions...

[Christiansok]

So I had my heart set on my stock looking steel rims for the longest time and the other day an oppurtunity to buy some locally finally popped up so I took it and bought a set of 6. They're 6 bolt, 15x6 rims, I believe they were orginal off a 69 or later??

Anways, now that I'm thinking of tires I've got a bad feeling in the pit of my stomach with this purchase. I'd like to get a set of 33 x 10.5 tires to mount on these rims. But realizing they're only 6 inches wide would definetely be pushing the limits if even possible. Would it even be safe to put 10.5 tires on a 6 wide rim? Or should I try and get a narrower tire like a 9.5? Or just try to sell my 15x6 rims to get some 15x8 ones? Any input would help.