I Roc Z Rims

I want to put I Roc Z rims onto my caprice, i got an 83 which i think has the 5 x 4.75 bolt pattern. will the 80s era iroc rims fit onto there? also the current tires ill be putting onto them is 275 70 15's

I want to put I Roc Z rims onto my caprice, i got an 83 which i think has the 5 x 4.75 bolt pattern. will the 80s era iroc rims fit onto there? also the current tires ill be putting onto them is 275 70 15's

the problem may be the off set...how deep they set into / out of the wheel well..

yeah i herd about the offesetting, i've seen many other box caprices with these rims so do you think they had to do any mods to the wheel wells? also i herd the iroc rims are 16" the ones i have now are 15's is that true? if i have to get new tires then its not worth it cause the tires i have now are still pretty new.

Is there a diff between an Iroc z28 rim and just an Iroc? the ones i want are this kind (with the black line in the center) and i belive the tire sizes are 215 65 16 correct? http://memimage.cardomain.com/ride_images/3/2417/3121/31041560003_large.jpg