That is Per Blixt's car, who is Jay's chief body/paint guy, not his head mechanic. Per did his best to preserve as much of the original fuel injection look to his restoration as possible (so some of the hardware is original) but he has actually adapted some Bosch Fuel Injectors and other elements to his engine, not a Holley system.
Per is a really nice guy and he tells me that Jay is the best boss he has ever had. Per took me though Jay's collection and I also had lunch with Jay and his workshop staff maybe some 10 years ago now when I delivered some Dodge Polara door panels to Per at his "work address". Little did I know at the time that he worked for Jay until he opened the gated collection to let me in to deliver the door panels to him.
The Chrysler 300 Club International, Inc. had its Fall yearly meet in Monrovia, California two weeks ago now and Per brought his car to that meet as well as Fall Fling and he had it on display at Jay Leno's garage when the 300 Club members had a tour of Jay's collection as two groups of 90 people each, or 180 total folks. We club members thought we might get to just meet Jay at his collection, but instead Jay personally hosted both the morning group and the afternoon groups himself and he let all the club members ask him as many questions as they wanted. We never thought he would essentially spend his whole day with the 300 Club members doing the tours personally. Per was also a part of the tours along with Jay. Just super, down to earth guys for sure. Most of the Chrysler 300 club members were floored that Jay would take so much of his time with all 180 of us.