Re: 73 mach 1 buildup
I had a '73 Mustang Grande (302) new, nice car that was sadly lacking in air to its lungs because of all the pollution equipment.
Nice car though, the weaknesses were the timing chain and the gas tank was prone to rust on the top face. Fixing that rust, the bracket that the forward lip of the tank sat on disintegrated and I had to replace it with a steel angle. The tank was strapped up close to the trunk floor and silt from the roads built up on the top face and the dampness rusted the tank out. The silt also sat on the tank support.
Just check the support or the tank may drop off.
A lady T boned me and the car went to the wreckers after 12 years.