I like the plan and the Cobra IRS is a smart choice because they're very affordable compared to Corvette stuff and way easier to narrow without changing geometry.
When planning your track width, just keep in mind, most 2 and 3 piece wheel manufacturers can only give backspacing up to about 2" of the overall width. i.e., the maximum backspace on an 11 wheel is 9" and figure at least .5" less on fronts because of mounting pad left for brake and hub clearances.
It's good insurance when doing a full chassis and a narrowed rearend to get the wheels first or at least mock-ups in your desired sizes and build around them.
Be sure to start a build thread so we can see this thing take shape and let us know if we can be of help in the design or wheel department.
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