It's no wonder the Slant 6 is so great!
Growing up, my dad had a 1962 Valiant that he totaled, then a 1964 Valiant and a 1964 Stepside Dodge D100, all with 225 /6s. He let me help him rebuild the slant in the 1964 Valiant that he bought used. Don't know how many times the odometer had tripped by that point but we found two broken distributor gears in the basepan. I currently have a 1980 Volare Duster with a 225 that runs great and I drove it 65 miles each way to work for 2 years with no issues. I was also fortunate enough to find a 1963 Valiant Signet 200, 2 door hardtop that needs a lot of body work but the 225 had been rebuilt and even has a metal tag attached to the block by a rebuilding service. I haven't driven it anywhere yet as the floor is rusted out where the accelerator pedal was mounted but it seems to run good with no smoke. Also, my Dart was a 225 with 3 on the tree when I got it but had a rod knock so it was a no brainer to pull it for a V8 swap. I'll have to open it up and check to see if it's number 5.