Need help with an original challenger r/t, asap

Thanks for all your help, It was in fact the timing chain was shot. The chain was SCARY loose, and the cam actually jumped a tooth or two, but I got all that taken care of and fired up, and all is well. Thanks for your advice. Now on to the second part of the problem. The car surges at cruising speed and has a lack of power, and really falls on its face when you get on it, especially at high rpm. I think it is fuel pressure, as it doesn't do it nearly as bad if you rev it up to redline with the car parked. If it was timing or electrical, it would do it at all times I would think. Also, I have eliminated the carburetor as I have put a known good rebuilt thermoquad on it, and no change, although it starts much better now. I'm thinking the sending unit sock is shot, and is starving the engine. It is the factory pump, lines and tank, never been opened up. The lines are 5/16 also, which is probably not helping if the engine is starving already. I fabbed up a fuel pressure gauge into the cockpit, and after dinner. I plan on takin it down the road and seeing what it reads. I know you want fuel pressure around 7-7.5 psi, but my questions is should the pressure drop as rpm's increase, or should it be able to supply a steady 7 psi throughout the rpm band? Thanks for any help, this is the last thing to get this car road ready!

Will