USPS doesn't ship heavy engines.
USHIP isn't international.
The items UPS and Fedex International will ship are ridiculously overpriced. Their international services are geared toward high volume commercial sellers that get 30-60% discounts off their outrageous prices. ....Also let this be a guide to those shipping USPS international- do it online. You cave a good couple $$.
You are going to be VERY limited to the company you use for an overseas freight endeavor.
My last R engine was shipped to Norway. Buyer handled all the paperwork, even found the company called JetCarrier. I crated the motor and dropped it off to some ghetto bonded warehouse in Linden NJ.
I'm gonna have to say a lot of google searching will be your friend here.
Another US buyer bought an S1K engine fro me and thankfully he handled shipping to Honduras. Plain and simple nothing (in my opinion) is worth the headache of overseas freight shipping. From cost, to risk involved. no thanks.