Jose, Glad to hear good results! Do you feel you actually gained something on the Power or Fuel fronts?
I had learned about Zero Degree as an aside in an exchange with an OP on another forum years ago. Our 460 had nearly 100,000 miles when we got it and I thought the OEM timing set (especially if it had nylon sprocket teeth!) could be worn out. Somehow, if I remember right, I'd found a water pump bolt stuck in the timing cover. Something like that, anyhow. I decided to replace Water Pump and Timing Set on a pre-emptive basis. The work was a lot like what you said about camber plates... Lots of labor but not all that tricky.
We ended up with Rebuilt Molly Carb (that Ford/Holley), Steel Timing Set with Zero Crank Sprocket, OEM Exhaust Manifolds and Crossover, No Cat (not OEM on a 49-state E350 in 1983), and Flowmaster 3-inch single exhaust with "Big Block" muffler. It started well, ran strong, got about 8-mpg best. You've solved the piston-driven A/C compressor issue ours had.
EDIT - I should add that FL had emissions testing which has since been completely discontinued. But when they did, anything built on or after emissions systems came into effect had to test and pass. Year model was around 1973 if I recall. VERY difficult to get older vehicles to pass, even if the system hadn't been "tampered."
And Jose, the Timing Set was actually in good condition. Nylon cam sprocket looked good, chain not stretched, retarded sprocket just broken in.
