Shipping From Canada to the US

All,

I found a very nice gentleman in London Ontario who specializes in 300ZX
parts.  We've agreed to the price on several items,  but I wanted to check
with people on experiences with mailing parts to the US.

Any recommendations on carriers or customs forms or anything else we may
need to know as neither of us are experienced at shipping across borders.

Tks,

MIke
'78 Midget
'87 300ZX