At least three Pantera owners have successfully modified an EFI base from a 351W to fit the Cleveland block, and have thousands of highway miles on the assembly. The key is to find a really patient TIG-welder with a band-saw and lots of time, and mock up on a spare block & heads. They also started with an aftermarket assembly that fits under a stock engine screen. The tops can be shaved a little for clearance.
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