I found an old issue of Hot Rod magazine (Sept. '85) and there's an little blurb about Mecham Racing producing Macho T/A's and Magnum Z's and IROC's. Some of these cars came equipped with 350s and 400s and Nash 5-speeds and Dana 44 rearends. Anyone ever heard of these or seen one?

 

I've heard of the Macho T/A's. Never heard of the Magnum Z's though. There's a site called The Premier Firebird Trans Am Gallery. www.Ordernet.com/Mean_Pontiac/ I think thats the address. Don't know if this helps, but the topic caught my eye.

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1989 Iroc-Z. 305TPI 5spd, G92 (230hp/300ft/lbs). 91-92Z28 groundeffects. Corvette Admiral Blue Metallic paint. Thermomaster chip, 160*stat & fan switch, Bosch +4 plugs, MAF screens removed, custom ram air, Flowmaster cat back, K&N, adj. fuel pres. reg.
72,000 miles. SWEET!!