Hi
If you must go with efi BJs Offroad in the USA did do a efi conversion , it was a Gm modified kit. They specialize in all FSJs and ship to Australia. have used them for years and have never been ripped off. Helpful.
l have had trouble with one other major supplier over there that only deals in FSJs and it took over 2 years to get my parts. Only when I accused them of working for the Taliban and sent hundreds of emails per day did they get scared of their security agencies and answered my emails and supplied the paid for parts eventually.
But at least it worked.
Email BJs and ask for advice as they supply and know lots bout these old girls.
peter