missmatched brakes 64 gt

Hi have a bit of a problem. Trying to make it work 10" stock drums in front. Oh 64 dart gt
F body 8 1/4 10" in the rear 67 mc drum no booster. Does anybody know what to use so i dont lock up the rear brakes before front. been looking around but havent found any answers to my knowlage. thankful for all input and hints on the matter. No disc conversion possible due to rules.
Jeppe swede. spells lik a rat.