i know this thread is a couple months old, but ive just done a efi and turbo upgrade on my 260z.
pulled a engineer certified v8 out so i technically did an engine swap.
up until today (the last day of september 2023) there had been an exemption on cars needing emissions testing done to satisfy the engineering requirements. i just got my car in on the 28th and had the engine certified.
all i needed was the engineer report and di the paperwork at rta. easy job