Greetings and welcome to the forum.
the Owner Gallery was intended to show of finished ready to ride bikes.
You'll get more responses if you move your post the the Vintage Forum where members show their recent finds, works in progress and post inquiries.
BTW, nice frame but it's somewhat of a mystery to me... It has a lot of 1980's features but...
For starters, your frame only has a single water bottle mount. By the mid 80's most performance bikes had mounts on the down tube and seat tube.
I've never seen a Gitane frame with that style of rear brake bridge.
They were usually found on Italian built frames.
Gitane used this style of brake bridge on their top models.
Lastly, during the early to mid 1980's Gitane used these short point lugs.
In 1985 they went back to these long point lugs on their Pro frames.
Gitane used those "bubble" font decals in 1983-1985 then again in 1987
Gitane, Peugeot and Motobecane made variations for the different world markets and your frame may have been a special make item??? They also built some special order frames for the French market.
My 1984 Gitane Team Pro frame as i received it.
Finished bike.
To answer your question about cranks, I like Shimano Biopace chainrings for climbing but I think that your bike would look better with the silver 600 cranks. they look to be in better condition too.
The later Shimano 600 components like yours were near the top of their product range and worked well. Newer Shimano RC55C4 brake pads and blocks will improve the braking drastically and they're inexpensive.
They come in gray or silver.

Chas.
SF Bay Area, CA USA
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1984 Criterium
1969 TdF
1971 TdF
1974 TdF
1984 TdF x 2 Bikes
1970 SC
1971 SC
1972 SC
1984 SC
1984 Team Pro
1985 Professional
1990s Team Replica