Just wanted to say thank you! I could not have fit my wheels without this! 
I got Drag dr-34 black with red lip...
Car has all poly in the frt and rear suspension. I converted to coilovers in the rear... 10 inch 300lb Summit springs with the 7 inch Coleman Racing sleeve and perch. In the front, I cut 1.5 coils off the stock WS6 springs (stiffest WS6 springs avail on 84)
18x8 front 47 offset with a 8-9mm spacer... effectively (39-40 offset). I knew a brake conversion was in my future and I found out the brake convesion added about 8-9mm, so this offset will dial me in perfect once that is completed! Front tire for now 225/45 (cheap used pair to get on the road) In the future I will be going with the same width or possibly wider but either way will be with a lower profile.
18x8.5 rear with 45 offset... only just a tiny bit of rubber out of the wheel well... just how I wanted it... Tire is a 265/35... Did not feel confident enough to try the 285s yet... maybe with an alignment I will have the space back there. I have about a finger b/w the spring perch and tire.
Everything fits perfect with no rubbing issues! 
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1984 Indy Fiero SE Pace Car Replica #770
"SE": Stormtrooper Edition