Distributor and vac advance

[Bigblue29]

I have a 50 chev 3100 with a later 235 straight 6 - I think from a 59 IIRC...

So I am gearing up for some warmer weather here in MN and I am trying to get some parts ordered so I am ready when its nice out and I have time to work in the garage.

I have to replace my master cylinder on the brakes. I think I have that one handled but whats a good source for parts? I have used classicparts.com and was happy with them- any others better?

Now the bigger challenge for me is replacing the vac advance and making sure the distributor is good. Can anyone help me out with some pointers on how to do this?

Thanks, guys around here are great!