Not mismatch, upgraded, modified, hot rodded, but definatly not mismatched.
Refrence an article in March 1998 High Performance Mopar called "Torque It Up" pages 14-15 and 78. Article talks about swapping in 2.74:1 low gear and 1.54:1 second gear in place of the stock 2.45:1 low and 1.45:1 second gear. Third gear remains 1:1. The parts are supposed to be found in an A999 transmission, but I discovered that some of the 78 and newer 904's with lock up also have the right gears AND had a 5 clutch high gear drum. SO now I have 5 clutches in my high gear drum, 4 in my second, and the gear ratio that in essence makes my 3:23's seem more like 3:55's in first and second gear but still give me highway milage of the 3:23's in drive.
As I have said though, drive comes in way late and I am worried that it may be doing it harm. I will try playing with the kick-down(thottle presure rod).
All I can say is when I get the bugs worked out, this is gonna be one hellaciously fun little 360 packed A body.
As to what you comment about the throttle pressure valve adjustment screw, I set it to what the Trans Scat performance kit instructions said to adjust it to, 1/8" between the valve and the throttle lever shaft piece that would other wise contact it. Does anybody else think that that might be wrong?