360.....hp?

Hey guy's,
For my first car i recieved a 1970 Dart Swinger. In this swinger is a 360. My 360 has a purple medium cam shaft, stock crank, pistons, etc. A old steel intake with a 600 carb. Hooker headers and it is hooked up to a 727 which connects to a 8 3/4 rearend.Basically my engine is very very close to completely stock. My question is what is a rough estimate on the amount of horses I will be pulling with this thing? I have recieved alot of challenges from other teens in 5.0 mustangs and tuners and i want to be confident in my cars ability to hold its own.

thanks alot,
Rob