Lou, your front derailleur should work fine with your new crank/chainrings.
Next trick is find a freewheel.
You're going to have to remove the old one and measure the overall thickness (width), and match that with a new (old stock) freewheel.
Good news is the threads should be easy to match.
A call to Yellow Jersey would be smart - he can probably fix you right up, or make a great recommendation - he's also the first choice for rebuilding old freewheels.
Any short-cage rear derailleur from the mid-60s through 70s should work fine with a 28t max rear cog. Chain wrap shouldn't be an issue.
The 36T/28t combination would give you a 35" low gear, which should get you out of the Olmos Basin in any direction, just fine.
Right now, your low gear is 57", and I can't blame you for squirming with that.
(yesterday on the final climb, when I pulled away from you on my Moser, I was in a 66" gear, and made most of that climb in a 73" gear - just checked my gear chart).
Any RD older than '86 should work fine with the cable pull of your stock shifters.
I have a nice Shimano 600 EX RD you can check out - very high mileage, bought new in '78.
Ran since '78 to about 6 years ago on my Grand Prix, and started off my Moser before I made the Chorus upgrade - it has the red jockey wheels below.
I have that French stem set aside to bring next week, I'll add the RD to the cigar box
If you want to keep your RD in the family, look for a Cyclo Super 60 RD
But the Shimano 600 EX is probably a better RD, and came new on many race bikes into the late 80s
And IMO, there is no better FD than Shimano 600 EX - still running on my International.