You don't have to wait. You can buy a Chrysler manufactured 426 Hemi now at $3.50gal.
426 Gen III Hemi Engine - 425 Horsepower
if they can get 420hp out of it, then a real 426ci should make ~480hp
We’ll get $0.28 gasoline when we get milk for a dollar a gallon or less. Inflation hits the oilfield as well. It costs more than $0.28 / gallon to get it and refine it and without it being discovered in places where you just have to dip oil up in buckets we’ll be extremely lucky to see sustained prices less than $3.00 in the near future.
Some technology could change that but I doubt it. Something like ultra cheap gas to liquids but that will only last for a short time of low prices.