Trying to do the actual math of fuel needs is a good place to start first but I'd say just maxing out the stock hpfp and then supplementing the rest by port Injection would do it.
The gt has two hpfp? I haven't read anything on that except for the ls7 is di and there are aftermarket hpfp and even aftermarket cams to run two hpfp on the ls7
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But this would still all be theredical still since the whole drive train would need to be upgraded