technical toyota question

i am totally new to toyota's (owned honda's last 8 years)

so i finally picked up a mk1 after years of wanting one and after reading up on 3rib and 7rib block and the different heads and intake mani's

i want to know if the cams are different from say 85-86 compared to 87-89
and if so can i benefit from using earlier cams in my 89?????? or what yar cams would work best in mine for now?