Shipping cylinder heads

Hello to all. With the wealth of knowledge on this site, I have a shipping question. I have a bare set of 915 "Z" heads I'm donating to "Rumblefish", a long time member here whom I've come to meet last summer, and I've come to respect. He has a 1973 "Cuda 340, and I'm donating my heads to the cause. The problem is, I live north of Seattle, and he's in central Florida. What's the cheapest way to ship the heads to him? I have some wood working skills, so I can build him a set of 3/4" plywood boxes with handles to ship them to him. Could any of my Mopar Brothers /Sisters please tell me the cheapest and safest way to get them there? Bare weight for each head is 48 pounds. Looking for sage advice to make sure they get there inone piece, without any bill that has a comma in it. Thanks in advance, Paul.