Visually I don't think you'll be near passing smog check. My 1979 is more complicated (the bvsv and abv/asv areas in particular)
but I recorded all the pieces that I had to get starting from ground zero in my build thread. You can see the final result here.
forum.ih8mud.com
I don't think you'll be able to necessarily "pay" someone to make it smog legal. If you go a re-smog route expect to spend
some serious time just hunting down the parts. I don't think a shop will necessarily do that for you.
One option that is kinda out there is to put a CARB compliant catalytic converter on it. It should work for the 1978
as well....and yes I know it only showed up in 1979. I show how to route that in my 1979 build
thread. A seriously suspect a good CARB catalytic converter will get you past any tailpipe emissions test.
Note a catalytic converter will work on the 1978 even without the heat sensor probe (its not an O2 sensor like in later models).
The heat sensor was present to shut parts of the system down if it got too hot. CATs these days can take lots more heat without
issues .... so theres really no need for that sensor and emissions computer controlling it. A straight modern CARB CAT just place inline
in the exhaust will cover lots of emissions ills