I had a car that had a real rotted front frame and I just used 2x4 rectangular tubbing and made a new front frame from the firewall forward and then put a mustang front end on it,
Fatman CAN help you out with that,
you just tell them how wide your new front frame is and they can set you up with a front end cross member...

I also had to repair a camaro/nova frontend on a 36 dodge that was put on in the wrong place, wheel base was off by over 1"
the Nova front end fit pretty good but then you have the chevy 4 3/4 bolt pattern.

a Dakota front frame could work as well, they have rack and pinion and disc brakes but if you get a post 91? it will have 6 lug rotors BUT the early Dakota 5 lug rotors will fit and give you the mopar/ford 4 1/2" bolt pattern

some pictures of your front end would be nice to see how bad the front end is on your car. Ron...