Reliability aside, the $/hp ratio favors chebby gas engines, and w/ a taller rear end, the stock six speed, and manual AFM, the $/mile would be pretty close too. Heck, a vette aside, someone could grab a brand spanking new vortec 5300 engine for about a grand less than used 4BTs go for on eh4y, shove it into a mid 80s/early 90s manual Camaro (maybe mess around w/ the rear end/trans ratios), and have a peppy muscle car w/ a brand new engine that can pull ~40+mpg on the freeway for a few grand.
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