66 monaco convertible 318 v8

In ONE respect, ANY Mopar convertible is "low production", by observation. Some more than others. Knowing the data plate decode can affect what it's ultimately worth, but not really "what it is" or might end up being.

By observation, changing powertrains can get somewhat tricky. Torsion bars related to engine choice, for example, but that can be worked around a bit. Similar with radiator size, transmissions, rear axles, and other related things. Chrylser built "package cars" (where everything was designed to work together, and work well) whereas GM seemed to build "option cars" where some things might get changed with larger engines, but NOT to the extent that Chrysler did. End result, keeping the OEM "small block" can work very well, in total, for a drive-around car that is used for enjoyment and pleasure. And other things where a 440 might not really be needed . . . except for people to drool over.

FWIW,
CBODY67
 
Something to consider: Your car is rare enough that you should consider building the original drivetrain rather than swapping it out. Canadian 1966 Dodge Monacos and convertibles had 318 poly motors which can be built to be quite stout and enjoyable to drive.
 
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