need help with cam

I do not know much about cam choices but i have a GM performance crate 350HO motor in my 84 TA. I have short tube headers and a H-pipe leading into my borla mufflers I want to get a cam that will increase my sound and my middle rpm power. If possible i do not want to change any internals. What are my choices and what are your thoughts?

Is it a flat tappet cam or hydraulic roller?

to be hoonest i dont even know, i looked at the engine sheet and i saw nothing about that on there either.

to be hoonest i dont even know, i looked at the engine sheet and i saw nothing about that on there either.

Hydraulic Flat tappet.

If it is a flat tappet, Lunati makes some nice cam kits, sold by Summit. You can call their tech line and tell them your setup and they'll recommend what size cam.

thanks man