engine help!

i have a 71 /6 225 auto. I just took possession of the car and while it starts pretty easily, it stalls quite a bit. Started right up when I got it home on the trailer, then I put it in reverse, and as soon as I gave it some gas, it stalled, over and over. Did it to in drive, but not quite as quickly as in reverse.
Can you guys give me an idea of where I need to start to tune this thing up a little bit so that it runs more smoothly? I am really new to this, and most, motors, so if you can dumb any advice down I would appreciate it.
Thanks all!