Camshaft in a 65 273

Years ago I ran a Crower cam (.427"/264 duration, as I recall) with stock non-adjustable rockers as my stock 273 rockers wouldn't hold an adjustment anyway. Cam worked well with 10:1 pistons, but REALLY woke up when moved from my old '66 Dart (904/2.94 gears) to my old '66 Barracuda (four speed/3.23 gears).