I like the 267 idea. I have had good success using a small Carter AFB and disconnecting the secondary linkage. They are so tunable with a strip kit. This was back in the 80s on a 231 in a Le Sabre. The car was originally a turbo coupe that came undone. We built a na engine with the AFB and dual exhaust and got low 30s mpg out of it.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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