I also swapped the crankset because the originals were 170's and I prefer 172.5, & I ditched the stock sidepulls for Mafac centerpulls.
One thing to consider is if you swap out the bottom bracket your options are fairly short and will be kind of pricey. I haven't changed mine, but if I'm not mistaken, the Moto's of that vintage sported Swiss threaded bottom brackets. You could get a T.A. for about $100.00 US or a Phil Wood for about $150.00 US.
Just keep all the original parts if in the future you decide to return to all original specs.