J2 was a J car not a MK-IV.
It was "broken in two" by the Miles crash, remains stored at Holman & Moody for Ford,
possession of the remains transferred to H&M by Ford @ 1971, reported to have been scrapped
The current car using "J2" was not built by Kar Kraft therefor not part of any of the KK build tubs ( J1 > J12) or any original "DNA"
Using "parts of the original" car does not transfer any provenance,
An accurate re-creation using original parts give some tribute to the original item, a lovely car
There is only one Mona Lisa, but many reproductions.
IMHO
jim p