no they will not
Not without modification
yes
Yes, but 1991 rims will NOT fit a 1993 camaro
Yes
Yes
I believe that the 5th gen 20'' rims will fit the 3rd gen Camaro. i know that they will fit the 4th gen so should fit the 3rd
NO
Not without modification (... but WHY?)
No
NO! buy a stupid donk to put ignorant ghetto rims on. don't ruin a camaro.
IROCs never had 20" rims
No they will not, the achieva has a bolt pattern of 5 lug on 100mm whereas the camaro is 5 lug on 4 3/4"