Oh boy do I!
In 1974 I bought my first Mustang, a fastback 302. Had that until family arrived, so had to buy a "family car". I always like that car, so in 1980, when my wife and I split up, I found a couple to chose from locally. The first was a Boss 351, except the motor had been swapped out for a 390 and the body was rough, pass.
Then I found a 72 Q code 4 speed Mach 1 in excellent condition other than it had been painted a (cough!) GM metallic burgundy. At that time, I knew next to nothing about these cars other than I really liked them. At the time I purchased it for 2 grand, all I was told about it was the motor block was not the original, which apparently had frozen and cracked, but it had solid lifters and a Chrysler 4 barrel carb. Coming from the UK, I was very familiar with solid lifter cams and valve adjustment, did it all the time on my beaters I had there.
So, in 1991, my new love and I decided to buy a house together. Needing money and acquiring 2 more kids, I decided to sell the 72 Mach 1. In hind sight, I didn't need to other than it would sit in the garage for another who knows how many years.
Fast forward to 2015. I was at the body shop where my current Mach 1 was repainted, just shooting the breeze with the owner, when a guy walked in. we got talking and he mentioned my car reminded him of when he and his buddy with a red Mach 1 would drag race each other down the high street in the same town where I bought it. A red Mach 1? He confirmed the owner was the same guy, so I asked if he knew anything about the motor. Then my jaw dropped. He told me it was a Boss 351 block with the intake from the Q code and that is why it had solid lifters. In all the time I drove the car, I never took the valve covers off to check anything out. The car was scary fast and I just drove the sh*t out of it until I stored it away for 8 years. Also in 1980, I bought a 72 H code Mach 1 as a parts car, but fixed it up and drove it as my winter beater until I sold it as well.
Here's a pic or two.
The Q code as it was just before I sold it, damn it!
The72 Q code and the 72 H code together on my lawn in 1981.
The 1971 302 Fatback.