Found this 383, worth it for my 65?

Ottmundr said

You can lose a lot of weight with just aluminum heads, intake and headers.

Do a search for Put your Big Block Dart on a diet or something like that.

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Big Block on a diet, on my sons 74 D200's 1968 383 we gained 1+ inch of height at the front bumper. We went with Eldy Performer aluminum heads, Mancini aluminum water pump housing, Mancini aluminum water pump, Eldy Manifold.
It can be done. But then we put the B Van lower arms on to drop the front down 4 inches.