I need a little enlightenment on this Holley carb

I have a 64 valiant with a 225 and a member sold me this Holley 2 bar carb which I like quite a bit.....but I need a little help with these ports and which ones I need and which ones I don't.......actually any information would be greeted warmly.:banghead:






no idea why pics turned out upside down.........but in the top pic you can see one port. in pic 2 you can see 4 ports, 2 big ones and 2 little ones.....clear as mud?