Cam Swap - 318/5.2L Magnum V8 - '65 Barracuda

Want to switch my stock cam out and put an aftermarket cam in a 1996 Dodge 'carbureted' Magnum 318/5.2L V8 that will be making its way into my 1965 Plymouth Barracuda. Shooting for the lopey/thumpy sound, like this Duster has in this video:

[ame="[URL]https://www.youtube.com/watch?v=ufRTSVOnmDQ"]Plymouth[/URL] Duster Hughes Whiplash cam - YouTube[/ame]

I believe I would have to switch my whole valve train up towards a flat-tappet setup to achieve this cam swap, looking for alternatives... Still got a long ways to learn about the define specifics/details of motors measurements and such, got the basics down though! Have experience with small blocks, not rebuilding necessarily, just the typical amateur regasket/reseal/repaint + throw a new timing chain in if needed.

Done a stock 5.2L Magnum Swap into a '65 Valiant 200, and was surprised by the dramatic difference in power vs a stock 2bbl 273. Anyways.. Any help would be greatly appreciated!
Hello there! I’m new to the group here and I came across your post. Been a few years I understand but I’m looking for some education on doing the same exact thing as you mention with a 5.2 magnum in place of a 273/ 2 barrel in my 1965 barracuda. If and when you have time of course, any advice or experience in those details in doing so would be greatly appreciated and how to worked out! Thanks so much!