Not Ranked
Regarding the same size wheels front and rear--this will duplicate the look and feel of the original street models, but I wouldn't do it if I had anything over 400 hp. The original street Cobras with 428 V8s were advertised at 375 hp (most of the time) using the old SAE gross horsepower ratings (probably closer to 320 hp net). But I've also seen original road test pictures of 427 Cobra street models with the same size Sunburst wheels (also 15 x 7.5") front and rear with the same tire size for all four corners. They were advertised at 425 hp (probably underrated for a 427!).
I discussed this several times with Peter et al during my wait. I didn't hear of any potential problems, and in fact they seemed rather enthusiastic about it since so few replicas are built as true street models.
Every choice I have made for the car has been weighted toward simplicity, reliability, and durability. With 381 hp on tap from a low-stressed 390 and a car weighing at most 2600 lbs, I think the power will take care of itself. (I'll admit that I did opt for a Blue Thunder medium riser intake manifold in aluminum. The look duplicates that of the Ford manifold right down to the embossed FE firing order on the left front runner).
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