First, what year is it and what is it in? Injected or carbed?
This engine has a lot of potential, the 145 hp rating reflects a very mild tune and a lot of emission-ization.
You can do a lot with these, and they are torquey, good for street and truck applications.
Most of us that have had similar vehicles with the 300 cid 6 and the 302 V8 preferred the 6.