I am not sure on the mid70s, but my '82 was a pain, because the lip of the pan just crossed the front sway bar.
I would drive it onto the ramps and make sure your engine's oil pan will clear suspension and/or steering components prior to saying ok.
otherwise, a lift, air tools, and some expertise (more than enough to make you extremely dangerous) would be involved.
I am not trying to dissuade you, and if you like, tomorrow, I will look into how many man hours at work for you.
...if the books say less than a couple, plan on most of your day on ramps; if it says more than 3.5-4hrs, I'd say that means, if it is a minor leak, go to 20W50 or straight 40 Racing oil, and see if that slows it 'til the price is right at the shop.
chris
nrt racing
713.933.5773 (7A-10P central)