I have a 1976 Motobecane Grand record frame (Reynolds 531 that year) wth a French-threaded bottom bracket shell (no bb) on which I would like to put a decent, reasonably period correct, crank. Catalogs say it came with a "TA Professional 52 42" but understand those are rather rare. The vintage Stronglights are attractive but really unsure of spindle length and spindle taper and don't want to get an expensive mish-mash of parts that don't fit with whatever BB I end up with (a VO with JIS taper, or an SKF or Phil Wood, or perhaps a used traditional off of ebay, are what i see as my BBoptions)
I've been checking Velobase, Sheldon Brown, tables at Phil Wood and elsewhere, but there are a lot of options, so any general suggestions or "rules of thumb" that would help narrow the focus would be appreciated!
I might opt for a "play it safe" approach and go with a Velo Orange crank, their 50.4 BCD crank (TA Cyclotouriste reproduction?) interests me and I don't have anything with that type of chainring set up.