If you plan on doing a full frame with sheet metal interior, etc, make certain that you do a well thought (as in seek professional advise) full cage for the car. A full frame by itself is not nearly as strong as a uni-body car with all of the funky little stampings, nooks, crannies, etc that the factory put in (ASSuming you run SFC's on the uni-body car, not trying to start a war here, merely stating the general case). Or rather, more specifically, the full frame car won't be as torsionally rigid in many cases. The point is, flat pieces of sheet metal are nowhere near as strong/stiff/rigid as the stamped pieces. If it were me, and the last ounce wasn't a big issue, I'd retain the stock floor pan. For a full on race car, well, that's completely different.
10" will help everything out just fine, thank you very much. You'll have room for the rack with the C5 front stuff without having to sacrifice steering, or requiring to lift the motor up (though there is another way to skin that cat, coming soon to a Lateral Dynamics front suspension system near you, just look for the car screaming by you on the road course, that'll be one of ours). Unfortunately, you don't just get to "bolt in" the C5 stuff and declare victory, but it is damn fine start (the spindle in particular) for designing a setup for our cars, they did a great job on getting the scrub radius WAY down which is important for the big tires we all want to run. If you are going to run turbos, the motor setback will really help weight distribution too, assuming you are going to hang the 'screws off of the front of the motor.
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