68 CAMARO WHEEL SIZE HELP..THANKS

[CUSTOMD]

68 camaro,vert.
i have the wheel and tire sizes figured out for the rear of this build...22x13
want to run a 20 front but not poss of width,offset and tire size.
if anybody is running a 20 on the front your input would be appreciated.
or if your running a 19 on the fron or poss even a 18...width,back spacing and tire size would also help.
i can convert to a 20 with either of those 2 wheels also.
thanks for any help