You answer vexes me. I was not sure by first sentence if you understood my question, but the 2nd sentence makes me think so.
To clarify, I have a 1970 Challenger, that was originally a /6 car, but I lost the fender tag years ago. It currently is 44/727, and I am toying with going back to /6 auto, with modifications, so I can afford to drive and enjoy it more often.
In this, I would either remove the big block stuff, and go back to a slant 6, perhaps hyperpak, or perhaps turbo, both are within my abilities. Most are right that the /6 without the tag is less desireable, but this car has shaved marker lights, etc that make it not the right car for concourse direction. I would lean towards a hot /6 that I can drive ALOT, or the mild 440 that I can drive SOME, but summer, and "presumed" higher gas prices will curtail the enjoyment.