I have a 75 Duster with a 440 and 727. I use the spool motor mounts and have a CSR shield. I had to bend/beat flat the lip in the trans tunnel where the firewall and floor pan meet. I also drilled 2 holes in the firewall to access the bell bolts to make it easier, but other than that it fits great once installed.
Same here... I made access holes in the firewall to make getting to the CSR shield bolts easier .. 68 Dart 408 small block with a 904 also had to cut off a few tabs on the trans case