There are 2 sets of holes in the suspension cross member for engine mounting V~6 & V~8 .
Did the car have a V~6?
If so I would look to see if the Motor mount was not put in the wrong hole.
If it is that far off with a upgrade in power there is going to be busted stuff .
You need to find WHY there is a mis alignment & only then can you fix what is wrong.
It is possible like you said that the frame is bent .
I would start with a basic measurement test.
Measure from center point of wheels on the left them the right .
Then get under the car & do a "X" measurement , from side to side front to back in the same spot on each side measure all these should be the same if they are not ..you have problems.