Q1, may i suggest a 4age? just kidding!! :)
however, what about a 4afe?.
i damn near did it in my ke70. however wiring scares me ;)
for the effort i think thats a better option than trying to EFI the sohc 4a.
Q2, i got two but I'm over here :y:
Q3, no :(
Q4, yes
Q5, clutch booster? :P
Q6, 42