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750 carb my 383 ran a whole lot better with a 650. Same general build. You might have to jet it down.The rest sounds great



Running a 650 Mighty Demon on mine and really like it. top end is probably a little down, but bottom end responsiveness is very snappy.

I also am not a huge fan of the heads either, but too each there own. At least they are closed chamber which will help a ton.

'73 GK6 Challenger Rallye - 340 4-Speed