Idle screw question. Rich or lean?

1984 was was the first year of efi believe. But it was tbi and not very good(3 years later brought multiport which was much better) It was an option. And worked with almost nothing but stock components.
Stock h.o. cam is pretty mild, more than a standard firing order 302 though. But nothing crazy. Rumor has it ferd took it from the parts pile for the 73 torino...I think the part numbers match up. Hence the 351w firing order on these 302.

Forums claim 18-20 with a stock cam is where it should be.