i want to get 36 tsl radials. they call for 10" rims, but im not sure they will fit cause the drums on the rear are huge!
what rims will fit?

They will fit.
I am running 15x10's on my 14ff with 4.5 inches of backspacing with no trouble.

it doesnt have any thing to do with the width of the wheel its the back spacing that matters

you can always put discs on the rear... i did mine for the price of a brake job + $11 per caliper (new at parts store) $2 for the set of bleeders and i think $45 for the brackets