Doug, it would be pretty easy to eliminate the 351C water pump and convert to a remote electric water pump or pumps. That would allow for a flat firewall. That’s what Renegade Hybrid’s did with their Porsche Chev conversions. Lowering the engine in the chassis buys more room in front too.
Another way to buy more room in the cabin is to move the pedals forward. I have the SACC 2” pedal box spacer in my Pantera and it makes a HUGE difference to driver comfort. It makes installing the pedal assy. more difficult though.
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