I have a 528 Hemi in a pretty stock appearing 68 Coronet with a 4 speed and 3.54 Dana out back. This combo has been together for about 20 years now. The hemi runs a 245/256 @ .050” hydraulic roller cam, 10:1 compression, MP single 4bbl intake, MP heads with mild port, and 850 demon carb. It has great street manners with good idle and low range. The torque is incredible as the gas pedal enables the tire crayon mode in pretty much any gear at any speed. Only downfall so far is fuel economy isn’t great, but you don’t build something like this and expect a Prius. I’m probably 6-8 mpg around town but never really drive it easy, and really haven’t driven much on the highway to know how it does there.