Need help with my first 350 v8

[Isaiah92260]

So I have a 350 with a 350 automatic trans.
I am not sure what year it is. The alternator is on the passenger side and has that big alternator bracket/ shield.
Anyways I just got started. I tuned up the Hei distributor, and rebuild the 4 barrel Holley carburetor. So once I fired it up, the valves sounded extremely flattery.

I popped open the valve cover and the valves were sloppy as hell.

So I just adjust them, now it runs decent. It doesn’t smoke, idles on it’s on fine.

But I noticed the 350 shakes a lot.

I am not sure if it has a mild cam or not?

Also what timing do you guys think is the best degree and the right idle speed?