79 Trans leak

hi guys,i own a 79 malibu classic 267ci (4.4) and i have a trans leak that i cant find.i kno its a leak because when i drive it hard (60-70 mph) it starts to smoke because trans fluid has sqirted everywhere near manifold.any solutions please help.i want to add sealent intil it get time to fix it

you may have a line leaking where it goes in the radiator or your seal is leaking...i also have a 79 malibu it's a 2 door but has a 229 v-6 in it i store it in the winter and my seal leaks but if i drive it long enough it will seal back up. but i do know 1 day i'm going to have pull tranny and put a new seal in it...other than that i dono on yours...
good luck.....