1989 Chevy Camaro Noise Under Vehicle

I have an 89 rally sport with 305 TBI and automatic. My concern is referring to a grinding noise coming from directly under the front seats. The niose is heard whenever you accelerate. It can also be felt in the gas pedal. The location seems to be between the rear of the engine and front of the transmission.
Possibly a bad torque converter or broken flywheel?
If anyone knows the symptoms of these conditions please comment. Any advice would be helpful. Thanks everyone