The hop alt will help and not work as hard as your stock one but as long as you have two yellow tops or a yellow top and a xs batt it won't work it as hard I would try to batts and if you still need little more power then put the hop alt on but I think you will be good with two batts
http://www.alternatorparts.com/cs130d_cs144_trk_suv_upgrade.htm
This is the one you will Ned for a chevy but he is right but two batts will probley get you by with what you Need
If I was you I would go with a yellow top and if you still drop a lot add an xs power batt for a 2nd power source but I have a red top and a yellow top plus a 5fard cap and I sit right at 14 volts
Yes Ground to the frame or that will happen cuz the body will not ground it the the car sees it as a short and wont start but if you can get to your frame sand that spot down vert well and even if you need to you can always drill a new hole hope this helps you out