'76 911 w/930 kit.

[BLK76911]

Gifted a '76 911 w/330 fender kit. Came w/original "Porsche "Twisted" wheels, 17", 23ET front, 15ET rear. Rear w/(3) 1/4 in staked spacers fall appx 1 1/2 from filling out the fender well. purchased a 2" spacer from fellow forum member, installed and had about 1/16th " gap in rear. Going to go w/non Porsche rims, probably from tire rack, will ask for their advice on back space and such but could someone give me a general idea as to what back space or whatever the terminology would be for a 930 kit. Thanks in advance.