BBC Dart block, Mahle crank pistons 10 to 1 compression. Edelbrock 79455 cnc oval port heads. Street tunnel ram port matched to the heads. 2 edelbrock 600 cfm carburetors. Howards cam #120405-10 .619/619 lift. 235/241 duration.Built dyno tested by LJs speed shop in Napa Ca.641HP 676 tq. Hughes built 4L80 transmission with manual valve body, sidewinder shifter. Ford 9 inch rear end with 3.70 gears.