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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Look at www.thefastman.com website. He recommends the 50mm for the 5.2L and also for the 5.9L if you do much towing. I just installed mine this week and it has definitely improved throttle response and low end torque. He does excellent work! He can help you with any questions you might have as well.
I believe you are referring to the aftermarket Holley. It is a 52mm which will be more than what you need if you have an unmodified motor and want to tow. Unless you just want to pay for a big chunk of aluminum I would go with The Fastman 50mm. A bit cheaper too.