I had my 4bt with p-pump delivered Friday. Found a guy who sells tested and running 4bt's on ebay with or without adapters.
I also bought a tested running 4BT on EBay and after reading on 4BT swaps about the guys testing these engines without water and cracking the cylinder heads I decided to pull mine and have it tested.
The machine shop stopped checking after 18 cracks in the first half of the head, you might want to have yours checked out if you have time.