'70 dart parking brake cable

ok, ive done my research and i know its been discussed before ... but .... i am replacing my e-brake cables, the rear ones are simple. but the front is killing me ... there was no cable when i purchased the car so i am trying to route it from scratch ... i know from the firewall it is supposed to go b/t the frame and floor pan, but its not happenning for me ! cant get the braided cable to fit through, nevermind the sheathing and clip on the end ! any help / pictures would be much appreciated !!! thanks !