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I spotted this on one of my FB groups (S30 Life), looks to possibly be a great product for all S30's. Interesting wording on the product description: an exact fit for '69-72 models to 06/72, then a very good fit for all later models. Anything coming out of the folks at S30 World is usually spot on. https://s30.world/product/datsun-240z-nissan-fairlady-z-set-of-door-rubbers-door-weather-strips-for-lr-side?fbclid=IwY2xjawFn5BlleHRuA2FlbQIxMAABHaFz08OpowthIb4moKiiPnBPNcmmq4RaSxakN8zokI1Jhbkwj32GjHmYIg_aem_XFFA0aZ0MJ1qJZtj6rG2cA

I struggled with my 78 280z for quite awhile on vacuum issues. @Dave WM A known test for pretty much being sure you don’t have any leaks is while at idle loosen the oil cap and slowly remove it. The engine should sputter and begin to stall.

Those numbers all look fine. I am a little concerned that you would be loosing 2 psi between the pump and the engine compartment, but that could just be different measurement methods or gauges. And those numbers are under low (or no) fuel demand conditions. I'm still wondering about some delivery issue that is only apparent under higher load conditions. Maybe you could tape your phone inside the engine compartment aimed at the gauge and take a short video? So about that whole front fire thing and looking for vacuum leaks... Make sure you take a good look at the rubber boot that fits between the AFM and the throttle body and all the associated hoses connected to it. PCV, etc. If you popped a crack in that boot, it'll run lean. Or if you damaged your PCV hose it will also.

1 last horn U7, 7/71: Looks untouched by how the thin paper gaskets were intact.

Since most of the users here are 'Murican, try windshield wiper in your searches. Also, did you look at the parts fiche to see what parts may be wear parts?