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I don't understand why a slower burning fuel with less chance of detonation means that you need "a quality set of forged piston." That article (thanks) didn't mention that problem either.
It's been well known that adding lead increases octane. It was a popular trick in the 1970s, with published tests showing the improvements, to mix unleaded and leaded gas. A 50/50 mix of regular leaded and regular unleaded resulted in higher octane than either on their own, due to the 'kick'...
Custom, yes, but I don't think Holley sells anything that large. They used to have the 600 cfm. 2bbl which would reach 650 with the optional velocity stacks, but you can't get it from them any longer.
The conversion factor is 1.414. Which means that the 1350 cfm. for a six-barrel 440 would flow 954 cfm. if it was measured the same way, as if it was a four barrel.
This page shows various 2bbl Carters that Chrysler used over the years, none of them go over 365 cfm. or, about the same as a 260...
Just for comparison, Shelby raised the 271 hp. 289 up to 306 hp. in the Shelby Mustang. But with four weber carbs, got the power up to 385 hp. for the Cobras.
There's a reasonably comprehensive write-up on the a body site for the ThermoQuad: https://www.forabodiesonly.com/mopar/attachments/a-carter-thermo-quad-guide-pdf.1714667249/