It really depends on the level of port work your Stealth heads have. For comparisonstock Edelbrock heads on a 450 with a 557 cam,Weiand single plane,Holley 950 HP,made 521 horsepower and 511 lbs-ft torque on my dyno.
That was with 2" headers. 1 7/8" headers netted 531" lbs-ft and 518 horsepower. I see too many guys go overboard on headers and lose some torque where they can use it to gain a couple horsepower up top and ruin a nice smooth torque curve while they're at it.
Keith