Clutch for a 66 Dart

I realize this is an old thread, but I thought I'd chime in cause I'm doing the same thing...
The original 4 speed setup for a 65 cuda (273) was a 9.25" not 9.5". But I too was concerned about poor performance of the 9.25" clutch when I would eventually mate the tranny with a mild 318. So I spent a lot of time at NAPA and found that you can order a 10" cutch/PP kit for the 65 cuda. ~$180 for the complete kit (clutch/PP, alignment tool...) the PP bolts onto the flywheel fine, and the height of the 10" PP is identical to the height of the PP on the 9.25"... So, it appears that it should bolt right up, but I haven't verified it yet! :salute: