as the one person said, the difference is between the one and two peice rear main seals, you should need the one from the 1986 up engine if it is the original 92 engine, which side is the dipstick on??? if it is on the left or drivers side then it will use the older one, but the passenger side dipstick does not mean that it is a one peice because i think they started that in 81 or 82. Then you go to like another person said, if it is a stroker engine, if they used a crank built for the 383 or if they used a modified 400 crank. I am going to say that since you are having trouble getting one with a hole big enough that you have the later engine, so any flexplate from 1986 up should work.
Now for the other question from greenbeanman, i think most of the aftermarket flexplates are of the dual bolt pattern design, saying that they will bolt up to the torque converter of a 350, 400, 700r4, ect transmissions, not to confuse the first two with engines, any of those transmissions will work fine for your 46, just if you use the 700r4 get it built first if you plan on rodding it out any as the early overdrive trannys were kinda known for bein a little weak
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