Got a new project and looking to get a little creative with it, and want to discuss engine options. I'm torn between Small blocks and BIG blocks. Speed is really not an issue, since i usually drive in the slow lane anyway but I want it to be a daily drive with decent mpg. Some people say big blocks get more mpg bcs they have to work less, other say small blocks are lighter and have plenty of power but if I'm going to get similar/close mpg then I rather have BIG block power. What do you guys think...don't be afraid to chime in on carbs, gear ratio, tire size etc. I'm just learning so all this stuff is relevant. What experiences have you had with your trucks....i'm really thinking about a Buick 455 (built up for torque) T56 trans and some 2.?? gears in the rear...is it possible to get good mileage with that? or would that be too sluggish. Im trying to find a happy medium between good MPG/power....ive heard some people even say they got like 23-25 mpg's with a decently tuned big block but im skeptical if thats even possible

Thanks!