How do identify what year my engine is?

My 68 Dart supposedly has a 360 engine in it. How can I tell what year car it came out of. It runs very well,but someone put an eldebrock intake and carb on it,not sure if that’s a good or a bad thing. I got it for a daily driver not to race it. I think the timing isn’t dialed in or the carb isn’t setup right because it idles as smooth as glad but doesn’t really seem to accelerate like it should. And I’m not meaning stomping on it.
Anyone here using an Eden rock setup like this? Would I be better off switching to a different carb for a daily driver? Hoping to get somewhat decent mileage for what it is

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