When driving a Challenger, I know I must not be alone in the thought, "Just how could I stuff a first-generation Hemi in this thing? Why settle for 376 cubes or 392, or 366, when one could have 8-10 liters of gaping maw to feed? Imagine having all the same systems as on a Hellcat, but with a big blower bird catcher sticking through the hood, still throttle-controlled by the computer acting on them butterflies directly, and getting (in comparison to past decades) great gas mileage to boot! You may have to join two Magnusons at an angle to get the airflow potential, but, hey, por que non? Imagine header tubes that have to snake carefully around the front struts and brakes before exiting via sidepipes, or zoomies if that is at all legal literally anywhere in the USA. No kill like overkill. Next stop: tub it. You would need a lot of rubber to keep that rear end planted. Maybe even a special Dana 60 like one factory Mopar drag car used back in the day: Aluminum center section and titanium tubes to minimize that unsprung mass. Or, a nice, subtle nitrous system of around 1000hp (just the nitrous system) to add to the motor. Holy Ring Gap, Batman!
Why not a 426 Hellephant engine? Look at Kevin Hart's 1970 Challenger. Kevin Hart and Bitchin' Rides Team Up for 1970 Dodge Challenger Rebuild
I desire to go the other way. I love the looks of the 1971 and 72 Plymouth Satellite/Roadrunner/GTX, but want the modern engine, transmission, brakes and suspension. I'm semi-serious about finding one of the old cars and putting a modern hemi and M6 in it.
mopar direct connection offers everything you need to do it, and other vendors too, there are (2) 6.1 Hemi's running around my town, one is a 1968 dodge dart, and a 70 Cuda. it's not hard to do, the earlier small block 727 will mate to the hemi if you wanted to go that direction?