I've done couple of conversions,
don't have to run them over the pits, just a form and your done,
Theres no problem selling, just keep the certificate to perhaps hand over to the new buyer.
I filled out that encyclopedia thick form for modifications, but wasted my time filling it out, and they wasted more of my time, making me wait 3 weeks for a phone call saying it wasnt necessary, sucked coz a sale fell through coz of the wait....anyhoos.....vent vent, straight forward proceedure changing engine numbers.