The steering wheel is stiff and pull me to the sides when the road bumpy just when I slow down and preparing to stop is that normal

 

might have better luck in the 370 section or even a 370 forum

 

Given the stiff suspension of the car, it's going to naturally want to 'veer' to the lowest point in the road; and when applying the brakes, that gets amplified.

 

If this problem is hitting bumps or anything other than level road and the car steering in that direction. The problem would be bumpsteer. I had bumpsteer issues when I lowered my mustang and it was corrected with offset ball joints. In the Z world they are called roll center adjusters. They are just extended ball joints. OP is the car lowered and aligned in spec. Alignment is crucial, than you can go on with trouble shooting. Is the car high mileage, shot bushings can cause all kinds of issues.