The "cost-is-no-issue" answer is: the ideal street/strip engine is any Gen 3 Hemi minus the 4700 pound Turd they come in. If that whole drivetrain can last the warranty period in those heavy boats imagine how long they will last in a car weighing 1500 pounds less?

Cost being an issue? Turbo any $400.00 Magnum small block with a high-quality turbo, beat the daylights out it and replace it a year or two later with another $400 engine. You could literally do it 20 times for the cost of a Gen 3 if you are not afraid of work.