" 1953 8n"
No, not really.
If it's a 1953, it's not an 8N. It's a NAA.
Overhead valves or flathead?
Front distributor or side distributor?
" i buy coil with internal resister"
No again. The do not have "internal resistors". They just have more windings to increase the resistance.
If it's a side distributor, go to NAPA & get a IC14SB 12 volt coil. Ho resistor needed. It has an internal resistance of 3.25 ohms
" i keep burning out the coil and the condenser."
Coils burn out from too much current (see tip # 38 at the link) And, it's really, really hard to burn up a round coil. And next to impossible to burn up a condenser.
So, I think you've got something else going on that gets "fixed" for a while after you replace the coil & condenser.
Post back w/ more info.
Tell us the model of the tractor & how you have determined the coil & condensers are bad.