Jon, welcome to the forum. I am the owner of the Z @siteunseen mentioned. The forum has been a great resource for me and there are some fantastic people in the community.
What is the Vin of your car?
I got my car about 2 years ago as an inoperable vehicle. The previous owner (PO) had owned it for 21 years, been restoring it the entire time but had not finished it. Some of it he had experts do, some of it he did himself. Most of the heavy lifting was done; body repairs, engine rebuilt, brake cylinders / clutch cylinders replace, but much was not finished. A bit of electrical needed finishing, gauges connected, door seals, some trim work, some other work needed redoing some of as it was not great quality, plus all the maint work on a vehicle that had not even moved for 6+ years; oils, brake fluids, gas, etc.
I was quite disciplined and broke up the work in phases and target timelines; Phase 1 - Running & Registered, Phase 2 - High priority, ...... + a small fun distractions list (eg, restoring steering wheel)
(in case you can't tell I am ex engineer, ex project manager. Some would argue somewhat OCD 😉 . I did work in the auto industry for a couple of years on the tools when I was studying, with the forum, youtube , factory servcie manual, I was confident I could figure stuff out again after 30+ years off the tools
Generally the 240z and the FS-L are almost identical, however a few got ya's. 99.9% of questions you have and problems you encounter will be the same as the 240z owners.
A summary of some of my findings of 240z vs JDM fairlady z. Some of these are hard learnt.
Electrical: there are some subtle differences. The main one I experienced is the indicators stalk - FZ-L have a push to pass button on the indicator arm. As a result the wiring is different (My PO had installed a US arm on my car and the lights would come on when the indicator way moved).
Another difference is the the FZL do not have the same fusible link the 240z does.
Engine and Carbs: given you do not have the original engine probably wont matter. Mine is a factor 2.0l engine with the orginal 5 speed box. The SU type carbs are smaller (38mm) compared to the 240z versions (which I think were 42mm?) also the bolt layout is different on them. The air filter box on FZL also did not have the warm air inlet.
Some differences in the seat belt layout. However there were also changes across series 1 and 2 240z, and 260z that might be in your car as well.
check out the thread for more details + JDM electrical diagram