I just got my rebuilt frame up restoration home...what type of gas are y'all using for 1972 240Z ?

If you are going to look a lot, drive a little, non-ethanol regular will serve you well. Can usually be found at marinas at a 60-70 cent per gallon more than premium. Do you know if the head was rebuilt for non-leaded gas? If not, there are supplements for that as well.

The head was definiitely not rebuilt...

My 73 came with an owner's manual, it says to use 96 octane. I remember a post about how 70's octane ratings are different from today. It didn't ping with 89 octane until I put a 81 JDM head on it, now it's set up for CA 91 octane, I think it likes Arizona 92 or 93 better though. Could be my imagination. I advance the timing slightly when I'm there. Wish I knew more about timing adjustments for various gasolines.

Maybe a valve job? They'll put better valve seats, and performance should improve.

You can get the lead replacement just about anywhere, even Wally World.

As for gas, the octane ratings back then used a different method. Today's 89 octane fuels should run just fine.

Here is a source for non-ethanol fuels:

Ethanol-free gas stations in the U.S. and Canada

What the FSM recommends is equivalent to today's 87.

The lowest we have here in Europe is 92 ( Germany only ) and 95 octane, and the highest 102 octane in Germany also. But I believe the manual says 95 minium. My 71 runs fine on 95...

But maybe they came with lower compression heads in the US, and you can use lower octane fuel... I don't know.

I use super only. 93 in Ga.

That depends on where the timing is set. I run nothing but 93 octane.

With my vaccum advance hooked up my car prefers 93 to 94 octane. It will ping on anything below 92.

The lowest we have here in Europe is 92 ( Germany only ) and 95 octane, and the highest 102 octane in Germany also. But I believe the manual says 95 minium. My 71 runs fine on 95...

But maybe they came with lower compression heads in the US, and you can use lower octane fuel... I don't know.

Octane is calculated differently in the US and Canada versus Europe. Generally, the numbers over here are 4-5 points lower than those in Europe. (Here's a Wikipedia article that explains the difference.) So, your 92 is comparable to our 87.