[72c10lover16]

I have a 72 c-10 350 4b with an automatic trans behind it and i also just bought a 69 chevy c-10 straight 6 with a 4 speed. I was hoping to put the 4 speed in my 72 eventually but i was wondering how that would work out. some people have told me the gearing may be to low im not sure though.
Please let me know anything you know