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my dad had a 300 J but it had a stage 3 engine in it. the whole set might be worth $2,000-3,000 if its all there. the smaller pieces are the harder to find. i think i have the factory service manual for that car. a 300J engine was NOT in a dodge it was in a chrysler a "C" body
iam just guessing on price. try to find a 300 web site. i know for sure there is at least one. the long rams are to improve torque around 2800- 3200 rpm.. the short rams improve HP around 5000 rpm. if you have the right carbs, do NOT serrate from the rest stuff. they are NOT the same as other AFBs.