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I think both chassis are doable if you can get the engineering of the rear engine layout to work. If the rear engine layout doesn’t work out great then I suggest looking at a mid-engine layout in a 2+2. As a bonus the 2+2 is usually a lot cheaper as they are less desirable, at least here in Europe. I would suggest starting with a really good 3D model or scan of a S30 Z (model and year doesn’t matter to much) and try and work out the engine and transmission placement as much as possible while leaving the rear taillight panels in place. The rest doesn’t matter for now. This is an ambitious project but I’m really excited to see how you’ll handle it.

Duffy thanks, this lets me complete most of the analysis. Lets have a look at the basics first, I've adjusted details too better match your set up. I've also set it to track given your cam choice as it is better suited for higher RPM power and the resultant port sizing based on what you told me (Intake) Exhaust Intake Valve Exhaust valve Bowls so far all your specs align quite nicely with the workbook prediction for an optimal engine for trackish use with a 7000rpm peak power band. Ill get you runner length specs tomorrow and simulated dyno run numbers