Degree the cam and figure out if it's the 108lsa or 114lsa. The 114 cam is absolute GARBAGE!
If it's the 108lsa, change the installed centerline to 100-102. Advance it 6-8 degrees. It will run like a whole different engine.
If it's the 114LSA, pull it and use it as a door stop.
Headers would provide a good increase in power everywhere.