Magnum Head Bang for the buck?

I have a Junk Yard 98 model 360 Magnum. My plan is to upgrade the cam to a Scott Brown custom grind that is around 226/240@ .050 and about .535 lift, Edelbrock RPM intake, 750 Quick Fuel DP, MP electronic Ignition, Headers, 2.5 " exhaust, 3.91 gears, 4-speed, 26.6" tall tires. Street trim 69 Barracuda notch.

I was jus thinking that if I can get a good set of heads that will increase my performance on this motor for a good value, I might try to up grade them while I am at it. Just trying to see what my options are...

This will be a street car with very minimal track runs. Probably will never see any slicks.

Thanks for all the help.