1969 Super Bee. 512" low deck. 10.6:1 compression, Trick Flow 240 heads, Trick Flow single plane, Thumper 950.1&7/8 tti headers into 3" tti exhaust with X-pipe and Dynomax Ultra-Flow mufflers. .555/.563 solid lift cam. 18 spline Hemi 4-speed. 3.54 Dana. I don't know about MPG, but it made 491 hp at the wheels on corn-free 90 octane. I don't have the tune dialed in, but so far it drives nice. It's snappy at pretty much any RPM. I think there's probably another 10-12 HP in the tune. I know there is a lot more in the top end if I went with more cam, more head, more intake, more carb, more header tube.