As far as the Heidt's subframe, they make a quality product but I believe they are still using a steel possibly MustangII based spindle in their setup. I poked around their website for 30 seconds but couldn't find the exact setup, but I would definitely recommend one of the subframes that is using C6 vette components.
Widening the car - I don't understand how this works unless you widen the whole car front to rear. You could get away with 1-1.5" bulge on the quarter probably, creating a coke bottle shape on the rear quarter, I've seen that done on Camaros before but don't have any links, although if you peruse every single Ironworks and JCG Customs Camaro thread I think there are one or two where some pushing and pulling has been going on. I've definitely seen it done. You could also check out the Rad Rides build photos of George Poteet's Torino so see one approach to bulging a quarter panel.
The Ring Brothers have widened a couple Mustangs front to rear (look for "The Producer") and the Eckler's Mach GT Mustang was widened 2" front to rear (2" per side). I am also currently widening my '67 Mustang the same way, but I think this works much better on the Mustang because they have more of a linear body line from the front fender through the rear, whereas the Camaros are a little more womanly in shape. So take a look around wish I had some links for you.
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