This may be long winded for what it is, I am building a Aveton Mataro Low and I purchased Sugino RD2 crank arms with a square taper. I was wondering if all 68mm english thread BB's with a square taper fit? I have a Campagnolo Centaur Double Bottom Bracket and was wondering if these crank arms will fit? Thanks for any input

Unless you want a wacky chainline, you need a 68x103mm JIS BB for that crankset.

What Scrod said.

Your Centaur BB is ISO 111mm