As the exhaust port is currently configured, they will not fit a shock tower car unless you cut the shock towers back somewhat. I plan to do this on my 68 Mustang, first by installing coil over shocks (which will be significantly smaller in diameter than the normal springs), and then trimming the towers for header clearance. My arm is being twisted by some folks to do a version of this head with the normal FE exhaust port location, so that shock tower surgery is not required and existing headers will fit, but I'm not sure if I'll be able to do that or not. So many people cut the shock towers on their cars, and there are so many kits out there to convert to a different front suspension, that I'm not sure it makes sense to offer a set of these heads with the stock exhaust location; the exhaust port efficiency would be way down if I had to do that. On the other hand, I sure would like to put a set of these heads on my 68 Shelby and my 69 Mach 1, and I'm certainly not going to cut the shock towers on those cars, so I'm waffling a bit on this...