I would keep your truck whatever it is, My brother had a berlinetta when we were younger and it was junk, 305 is one of the worst motors chevy made. Those things were notorious for electrical problems.
I have to agree with Sharko. Those cars almost fall into the category of "buckets". Trust me I almost bought when it my youth and am so glad I did not. The front ends are weak, the suspension is weak, and the overall design of the car is questionable. By no means am I trying to be a jerk. However I just don't want you making a mistake I almost made.