Getting Ready for the Magnum Swap. (help?)

TrailBeast said

No idea on the 1/4 but it's built to drive the hell out of and has freeway gears in it.
Estimates during the build were around 350hp with my small dual plane and 600 carb.
An Airgap and a 750 Holley is supposed to put it higher, but that's not what it was built to do.
It was built with fuel economy, reliability in mind as top needs.:D

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So in your opinion, for a mostly streetcar (maybe see a drag strip a few times and hit some autox/road course tracks) would you recommend I do the full magnum swap like BadAss71 did (efi, gauges, hvac, etc) but build the motor up kinda like yours or do a bone stock, 485hp 392 Hemi and hopefully be able to get 22-25mpg? I do have an HDK front suspension coming so that’d make more room for either engine.