I would replace the front apron. You will also need the reinforcement under the battery that has nuts to hold the battery tray. They were selling them on ebay and they were great. I found the link for another member last week and sent . The new repo panel will not have the holes for the fender nuts. Drill and file and 30 min. done. Drilling the spot welds is more time consuming than anything. Be sure and wash that whole area with baking soda to kill the acid. I would fix frame while in there.
Carpenter sells an excellent battery tray looks just like and original.
Thanks! I am in Durham NC by the way. If you are ever through here hit me up. Work has kept me busy and I haven’t been through the mountains lately.
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If you make it to the mountains give me a shout we can go visit some of the car guys here. Been putting off going to verify a couple of the 427 mustangs that are near here. One in Franklin and the other in Asheville. There was one in Spartanburg also when i went to car show at BMW plant it was there. One of Bud Moore old employees had it probably got at Ford from prototype shop like he did the Torino King Cobras that are now worth a million. Same guy has the King Cobra that has the 427 mustang. I know Marti says non on his list but prototypes were not on his records. It could have been a DSO special order also and Marti did not get those records. I think the Bud Moore paid $1,200 or $1,500 for the King Cobra cars. He had been to Ford to get some Mustangs to build for Trans Am racing and came out of the prototype area and saw them and ask what was up. Ford was going to crush but sold them to him. I am sure others at Ford got cars out also. Maybe someone has that mid engine Boss 429 stuck in a barn somewhere.