Hello again good people of bikefourms. I am building up an old frame and for for the first time I want to do it properly rather than just throw on whatever I can find. It is a late 80's Japanese frame and I am pretty sure I want to put on suntour cyclone or similar derailleurs and shifters. I want it to be friction but I know indexing had gained popularity by then. Here are my questions:
Is there a way to tell when a derailleur is friction or indexed just by looking?
The downtube has 2 shifter bosses so I need shifters without a clamp, right?
What other brand/models would you recommend?

I have shimano 600 pedals going on it and a Sugino crank. I am hoping to only make it a partial frankenstein.

thanks.