kinda new to working on cars

i have a 71nova 350 edelbrock intake and carb 650 got a comp cam mild racing cam installed and i dont know what kind of heads are on right now im GUESSING stock heads but im not sure any way of finding out please tell me ?

what i was wondering is how much hp do you think im running right now? and if i put vortec cast iron heads on ... how much hp would it put it up to.