As far as 351W using pistons from the 5.0 or other 289 or 302 cu.in. engines, or visa-versa, I wouldn't try this at home if I were you! One might want to review the piston compression height values first! Perhaps, if one qualifies a particular non-stock connecting rod length or crankshaft stroke combination, well........ maybe.
It is, hard for many to grasp, but in a carbureted application, with the exception of the accelerator pump system within the carburetor, providing an intermittent fueling value upon linkage movement, one is only directly controlling an air valve, not fuel. And, that it is only the air motion which "draws" or "siphons" the fuel into the induction volume.
But, I totally agree, that the FE engine can be as fuel efficient as other pushrod engines, both as carbureted or as converted to E.F.I.
Scott.
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