how much room does using coilovers give you over stock suspension

Yes it will give you more room if you go with a bigger wheels. What are you trying to do?

i want to fit at least a 10" wheel. have you
seen the "pro street fiero" in Hot Rod magazine Oct'87 with the "Built" 4 cyl.

I believe this is the article you're talking about. If anyone's interested, I should be getting a scanner soon and have a lot of magazine information on these cars.
Hot Rod Top Secret SD Fiero Article, October 1987

Hot Rod Article Pic

Billet Aluminum Strut Spacers Used to Move Strut Inboard:

Aluminum Upper Strut Mount / Spacer Assembly:

Strut Assembly With Billet Aluminum Spacer Installed on Car:

Strut Assembly Installed Package:

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Ben3843100@hotmail.com
88 GT 3800 Series II Auto
86 SC Iron Duke 5 Speed

Yes, that's exactly what i'm talking about. Do you know anyone who makes these parts?

Those are custom one-offs, but I'm thinking of designing strut blocks like that. If more people want them it would be motivation for me to hurry up and get them finished.

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'87 Fiero GT: Northstar, Getrag, TGP wheels, rear sway bar, rod end links, bushings, etc.
'90 Pontiac 6000 SE AWD: Leaking ABS unit fixed, load levelling rear suspension fixed, still slow