Just can't get the timing right and it has no bolt 1980 Chrysler lebaron 3.7l

So I found it for $700 I have replaced alot distributor,coil, alternator,starter, spark plugs and wires, ballast resistor, all had reasons why but I have the valve covers off and I look for the intake valve to open and close then set the balancer to the mark on timing markto zero and the rotor to number spark plug and it just cranks stop crank. But I had it backfiring out the carb with gas idk what's going on?