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If you do a cam swap only (gt40) heads you'll gain like 10 hp but at least you'd have "new and improved" valvetrain. If you add the Vortech 6-8#'s to your current set up with the stock cam you'll probably be in the ballpark of 350 maybe more. If this is a street car that might see the dragstrip once or twice a year, what I would do is keep the gt40's, get a cam that's in the .500 lift and 281 duration with the appropriate springs, a new timing set, and add a Vortech kit. You'll still be shifting around 5,600 but you'll be making over 100 hp at 5,600 than you are now.
Don't Sext and Drive.
I like this idea alot more than the others, if I went went a Steeda #19, Crane 2031, Or Anderson N-41 (Most recommended cam to me) what valvetrain would you recommend (Don't quite understand as of yet what exact springs/retainers/lifters youd need for certain cams do to lack of experience). Car has alot of bolt ons, and I got a steal on some long tubes so those will most likely make their way onto the car as well as a new tune and some other fun bits.
Thanks alot for the info btw