Mopar’s Crate HEMI Engine Kits let owners drop modern HEMI power into 1975-and-earlier muscle like the Charger, Challenger, and ‘Cuda. The 345 kit takes the 5.7-liter to 383 horsepower, while the 392 kit holds the 6.4-liter at 485, both optimized for manual transmissions and priced at $1,795. YOUCAR breaks down what’s included and the fine print that matters. Watch to see whether one of these belongs in your project.