I have a mid 80s Zebra touring bike, currently running Shimano Thunderbird/Eagle derailleurs and 333 down tube shifters.

1. I am replacing the downtube shifters with Sunline bar mounted friction thumb shifters.

2. I have a spare Shimano Deore LX triple crankset/bb with 50/38/26 chainrings to replace the original cottered 52/40 double crankset, will the existing Eagle FD work until I can find a suitable replacement? when it comes time to replace should i get a Deore LX/Xt or try to find a Vintage 600 triple FD? keeping in mind the Sunline thumbies.

3. I am planning on keeping the 27" wheels as i have purchased a new 27" wheelset and Conti Gatorhardshells. I also had purchased a new 14-28 5 speed freewheel. when it comes time to upgrade the RD should I get a matching LX/XT or again try to find a vintage 600 or something like it? again keeping the thumbies.

4. last question...i have a new 5 speed SRAM chain, should i keep this or look into a newer, narrower chain? i have a spare 9 speed wippermann lying around but upon searching the internet i hear that it will not last very long on a 5 speed/friction set up.

thanks in advance!