Stock 360 Upgrades for Crusher Cuda?

Professor Fate said
Well, you'll never get into the 12s with the stock 273 manifold. Maybe with some Magnum or 340 manifolds if you can get them snuck into the early A. Layson's (Spitfire) headers are fenderwell, and I thought that you didn't want to cut your inner fenders. There's a thread on here somewhere about modifying the #1 tube on Hedman's shorty headers for later As so they fit an early A- I'll see if I can dig it up.

I was under the impression that the "Spitfire" headers were just a different layout without collector and that they dump over the torsion bars. It appeared that it took some tinkering, but once you were past the torsion bars, it was all clear. And they worked with the aftermarket 340/360 engine mounts and manual steering.