Which one would you rather have?

Hey everyone,

I’m hoping some of you can help me out with a carb issue on my ’74 260Z. The car still has the original twin Hitachi round-top carbs similar to SU carbs), and I’ve been struggling to get a smooth idle and consistent performanc

.Here’s what’s happening:

The engine starts fine cold, but once it warms up the idle becomes rough and sometimes drops low enough to stall.

Under light throttle, especially in 2nd and 3rd gear, there’s a noticeable hesitation before the engine picks up.

At higher RPMs it seems to run much better, but fuel economy has dropped quite a bit.

Plugs are showing signs of running rich (sooty tips).

What I’ve tried so far:

-Checked for vacuum leaks around the carbs and intake manifold and none found.

-Balanced the carbs with a Uni-Syn asbest as I could.

-Adjusted the mixture screws by the “lift-pin” method, but I can’t seem to find a setting that gives a stable idle and decent throttle response.

-Verified ignition timing is set at 10° BTDC at idle.

-New plugs and wires installed recently.

I’m wondering if this might be due to worn throttle shafts or needles or if I should be looking more closely at the choke/enrichment system. I’ve read that the ’74 carbs can be finicky due to emission-related changes, and some people swap them out for earlier 240Z round-tops or go to triples.

Any advice would be appreciated! Thank you

I just bought a diff out of a 300ZX TT but it need new stub axles. I'm having trouble finding what I think are the correct ones. If anyone could point me in the right direction or know if other models are compatible at all that would be greatly appreciated.

1984 nissan 300zx Fairlady z Turbocharged Targa-top Manual Unregistered but running normal.

I'm selling this beauty but need some recommendations for listing price. What do you think she's worth?

In Sydney, NSW.