I don't know much about the 1965 2 bbl 383. I know before 1965 most 2 bbl big blocks were 361's and 383's usually had 4 bbl carbs. Before 1967 the 2bbl 383 had the same camshaft as the 2bbl 361. The 1966 2bbl 383 had the largest 2bbl carb ever used but still had the 361 cam. The 1967 2bbl 383 got the same cam as the 4bbl 383 but the carb was smaller than the 1966. so 1966 was a large 2bbl carb with a small cam and 1967 was a smaller 2bbl carb with a 4bbl cam. In 1968 when the heads went to the 906 heads the intake was upgraded to match the heads and was a high rise with the same height as the 1968 383 4bbl intake. So 1968 got big exhaust valves with better intake and exhaust ports and a high rise intake on the 2bbl 383. The intake makes a big power difference. When the 361 was discontinued so was it's cam so the cam became the old 4bbl 383 cam before the magnum cam. 1968 and 1969 may have been the best years for the 2bbl 383 but the 4bbl 383 always made more when it's 4bbl carb was increased in size so the carb was still a restriction on the 4bbl 383. Swapping the 383 Magnum carb for a 440 Magnum carb really helped a lot. The old 1967 and older low rise intakes were pretty restrictive. Mopar used to sell single plane 2x4bbl intakes complete with carbs and air filters in 1966.
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