Not an "A" body, but I was able to run a 12.193 @ 112.27 MPH in Mom's 2006 Daytona. 5.7 N/A all motor @ 4150# race weight. The cam supports MDS too.(multiple displacement system)
I have Josh convinced that a junkyard 5.7 Hemi has a lot more potential @ a budget than an LA block in his "65" Valiant.
$500 for a good core from a low milage RAM & about $1700 for cam & heads will put over 400 HP on the ground W/headers & a free flowing exhaust.
The "06" charger puts out 421 STD RWHP & 411 RWTQ