That battery ground lead you have on the exhaust manifold will be a problem sooner or later due to heat soak from the exhaust...
If you look on the top of the alternator bracket, you will see two threaded holes, bolt the ground lead to one of those bolt holes...make sure the ground area is cleaned of all old paint and rust.
Andy4639 is totally correct...you can never have too many ground straps...
Stay safe young man...
