No substitution period. I love that 429!! Too bad you don't still have that one!! I added to my last post. Go check it out.....Scroll up......Been a Mustang owner forever. First was a 64 1/2 gt, then a 65, 67 and my favorite was a 70’ Boss 429, an 89’ and now this 15’. The boss was only rated at 375 hp but was actually more like the 2015 coyote at 435. Any way you look at it cubic inches and horsepower is where it’s at for most us country boys

Before with the 383, I'd spin the tires anything 40MPH or below if you punched it. The 434 will get sideways at 60MPH.
