70 340 4-speed dart - talk me off the ledge

Well,well, that is just awful. Keep in mind that the entire weight of the front end(less the wheels) goes directly into that T-bar X-member. And when you put the car through it's paces, all of that weight may go into just one side. And if you jump it, whoa, that's more math than I know how to do.
The point is this; that T-bar crossmember better be well anchored into a solid frame and solid rockers and a solid floor. With what I see, the holes are just the tip of the iceberg. This is not your 69 Chevelle. This is a unibody. The entire car is the frame.The entire car.