1975 Chevy Nova Shakes and wont go into gear

I just got the Camshaft drive repaired on my nova. Now when I drive it it shakes like crazy. When it's on the freeway going 70 mpg its fine but when I start it up It refused to go into gear unless I really rev the engine. When pushing on the gas after I first put it into drive it acts like it's in neutral and will not go forward. When driving in stop and go traffic it vibrates violently and sometimes shuts down.

On another note the brakes are taking more of an effort for me to use. When I use the breaks they go slowly down to the floor and the car will not stop untill my foot is all the way down to the ground. The mechanic said my breaks looked fine.

Whats wrong with my car? :(