250 gto

For the sake of keeping this in the same thread. I found a little more info on the car in the photo- unfortunately it seems the owner passed away last year.
But this post on hybridz says he replaced his Weber 45s and actually saw better gas mileage and great throttle response 
https://forums.hybridz.org/topic/64666-mikuni-hsr45/?do=findComment&comment=1229737
“I decided to try my own setup with 6 HSR45 Mikunis. I had previously run Weber 45's.  I used the original linkage so that I could return to the Webers if I wasn't happy with Mikunis.  Because of the shape of my extracters I had to add some extensions as The bowl of carb 4 was hitting the exhaust.  Apart from that it was pretty straight forward with the carbs being quite straight forward to tune. The throttle response is very good and although I wasn't looking for it the mpg ismuch improved over the Webers.”
 
This of course does not help my decision process… on one hand it says to me it works! But on the other hand it makes me wonder if I should do 45s? I do believe it was a “built” engine but to what extent I don’t know. 

Gave them a try - says they haven’t done a 6 pack on a Z. But need to follow up with a few questions 

This place might be worth a contact.  Looks like they sell a 6 pack of them.  
http://www.v-performance.com/products/air_fuel.html?fbclid=IwAR3FfO4d5QpJU7bm0KC7kAo-sjYWIp5mc0xLBx0K4qM_-k3NBlq6VOE6JzI
 

I’ll definitely keep everyone posted- and if I go with 6 I’ll probably start a thread on it so there is hopefully some long term info on it.
really wish I could get in touch with one of the few people who have done it.
But I’m thinking 6 42s should do it and hopefully be ok.

First I asked them about Mikuni jet compatibility; since I was considering using their jets instead of Weber and had been told mikuni jets would fit- the answer is no they wont
“Mikuni genuine main jet cannot be used for OER products.
2. Only Mikuni genuine Air Jet 40φ can be used for OER
3. All OER Jet can be used for Mikuni”
 
I had better luck with a quick response, responding back to that email asking if they had any jetting recommendations for an L28 as a starting point.
To which they gave me the linked their product page and what jets come stock and said 
“Jetting and other settings will vary depending on your vehicle, engine condition, climate, environment, and the features you require.
Please enjoy the setting through trial and error!”
I can’t really fault them to their response to the jetting suggestions but I had heard they could help. 
 
So they is some communication there. Just not ideal- but also not too surprising considering the language barrier.