Help with old horror films...

Long ago.....late 70's, I was about 8 years old and was up late one night watching tv hoping to come across a good horror film.

I was hoping someone could help me track down two films that I remember coming across that night.

The first one all I can remember was a scene where someone was driving and old 40's model black sedan or limo. They were chasing someone who was running on the road. As they got close to them a large blade sprung from the door and cut the victims down. The passenger in the car was a large man dressed much like a 40's gangster. That's all I can remember of the film. It seemed really scary at the time but then I was only 8.

The second film I never saw but it was a trailer that came on during a commercial break from the above film. The trailer showed a painting of a hand and on each finger of the hand was a severed head. The narrator said the film was so scary that they could not show scenes on television. For some reason I seem the remember the title as "guts" or "grits" or something like that. Again I was only 8 so I could be way off on the title but I am sure of the painting of the hand and heads...

Do either of these ring a bell to anyone out there?

Thanks ahead of time.....and good horror to you all!