Rare Dodge Dart GT? Which engine is this?

Race Engine . . Hmmmm...

Performance Engine thinking yes.

Here are some more clues to the puzzle as @Swinger 340 has stated about it having the early Edelbrock Performer 4 barrel intake manifold with the thermostat mount bolts parallel to the bypass hose (mopar thermostat thermostat housing bolts are 90° to the bypass hose).

View attachment 1716041079

Spread Bore, with possible thermoquad or even Quadrajet with the larger secondaries that fit the spread bore manifold.
"4 Barrel"

Then the fact the timimg cover has no paint on it, probably because they were in there putting a mild performance cam in it.

So yeah, 4 barrel carb, 4 barrel aluminum intake and performance camshaft upgrade, that will wake it up.

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Now here is the reason the Alternator is on the driver's side. It's because their made up V8 conversion mount on the passenger side is mounted to the head, and is in the way to mount the Alternator there on that side.

View attachment 1716041089

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So one other is the fact the car has a 4 speed that has been swapped in there to go along with their performance upgraded V8 they dropped in.

Original quite sure was the 170 slant 6 with a 3 on the tree in '64, 3.23 rear gears.

3.23 rear gears are probably still in it, good match ratio for the V8 and 4 spd that is in it now. (Until it blows out . . 7 1/4" rear end)

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View attachment 1716041093
That is even looking like an aluminum 4 bbl. intake manifold in this picture, once you get the lighting right.

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So Yeah, Norway may have some of us from the USA eating "Crow" when we find out what that engine setup really is.

☆☆☆☆☆
Nobody's eatin crow. Described as "race engine" and it's not. Simple as that. Nobody ever said it couldn't be some form of "performance".