That is super cool! Love the 5 speed conversion. Price is high, yes, but I can see the value if it was done well. I have a wacky dream someday of doing this to a Boattail Riviera.
Have to wonder what Bellhousing and Transmission they used. Am guessing an '88 - '98 Chev / GMC truck for trans, perhaps McLeod for the bellhousing. Ebay ad description leaves a lot to be desired. Sounds as if written by non-technical dealer individual.