I am looking for a new cam for my 78 silver edition vette, and I was wondering which cam would be the best.

 

A lot more information is needed to determine a good cam choice. First, what kind of driving are you intending to do? What engine is in the car? What transmission? What rear gears? I'm in no way able to make a reccomendation as I'm no expert in cam selection, but I know these things are important. All the reputable cam companies can help you make a good choice.

 

C3 4ME has given you helpful suggestions. Especially about contacting the cam companies. Contact 2 or 3 popular companies & see if they give you similar cam specs. Then you'll know you're choosing the right one for your application. And.. they will usually offer other suggestions about a compatible assembly. You might find out there's more involved than just the cam.
Asking Forum members is only going to give you their opinions. Just look at previous posts where a member asked about " which xxx should I buy " and you will see a lengthy list of "opinions". I trust the manufacturers & engineers who designed the equipment.

 

Assuming you have a bone stock 78 SA Vette, the best advice is to "keep it mild." You don't have the compression ratio, rear end ratio, or the airflow capability through the heads or the exhaust to warrant any radical cam change. But you can benefit from a mild, modern-design dual-pattern cam with a slight upgrade in specs from the stock cam.

Some notes:
Assuming you have an L82, your stock cam has a duration at .050 of 222 degrees with lift of .450/.460. If you need to pass emissions, you want to be careful about how much bigger you go on the cam. I've had good luck with the CompCams XE262H for mild upgrades such as yours, running stock gears, stock converter, and stock manifolds. This cam specs out at 218/224 duration at .050 with lift at .462/.469. The lobe separation angle is different from stock, so along with the dual pattern duration, this cam can get you a mild upgrade without destroying the drivability of the car. I'd be looking in this spec range if I were you.

So keep it conservative - anything big is going to make your car miserable to drive, and will cause a radical decrease in overall performance.

But here are some other ideas if you're just looking for some better performance:
The L82 cam is really not that bad for the limitations of the rest of the engine. You can gain significant performance by changing the 2-1-2 restrictive exhaust system, and then setting up your distributor with an aggressive timing curve along with a good carb tune and setup. These changes will gain you more than a mild cam change by itself.

Lars