Sam, the issue these days would be the shipping, up to a couple of years ago, an engine could be simply strapped to a pallet and shipped as a dry engine via motor freight.
Since 2020, there is now a 1.27 per gallon "Green Energy Fee", which drives up the cost of shipping ( and everything else as well ).
Pricing engine parts from Massachusetts to Texas ( one pallet estimated @ 90 LBS ), the shipping estimate came in at 499.00.
If the engine was broken down and shipped UPS in two 50 LB boxes, the estimate came in around 29.00 per box, with a three day shipping ( Kind of defeats the purpose of a quality overhaul from R&D Engineering ).
I think that maybe a local sale would work out best for you, since shipping fees seem to change with the rising cost of diesel fuel, and I'm not going to give you a low offer on your dad's engine, just because the "Green Administration" wants to be unfriendly to people that use over the road shipping.
( the few McCullochs that I have purchased were all between 300.00 - 500.00, but they all needed a lot of work as well )
Curt Parks