You do have a passenger block circa 1962, the "068" casting on the rear flange and the "QB" stamping on the front pad confirms that. Those are quite desirable
. You probably have the "690" castings for cylinder heads. Looks like an "881" dual quad intake. Nice combination. When you get the chance, let us know which numbered carbs are under that chrome air cleaner. The 2x4 chrome air cleaner was used on the 1963 and 1964 models that had the 425 HP rating. In 1962 that rating for the dual quad setup was 409 horses.
If you decide to yank it out, I'd freshen up what I already have, but then I prefer "iron" versus "aluminum" except when it comes to intakes
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Or you could send it to me and I'll put it one of my 1962 passenger cars
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So, while you don't have a "numbers matching" or even "period correct" block and heads, you do have a combination a lot of guys will be envious of, congrats!
Keep us posted as you go through things, collectively we give great advise, you get to make the decisions (and foot the bills!)
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Cheers! TomK