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They put the 7 1/4 behind 318s in many F and M bodies and even some of the J bodies.
There are four general weak points:
1) The computerized ignition and carb Sounds like you addressed that.
2) The plastic gears on the timing chain
3) The lockup torque converter
4) The 7 1/4 rear axle.
Not every one will have all those problems. And a cop car didn't have the timing chain or rear axle problems.
Just as a precaution, I'd look for an 8 1/4 axle from an F/J/M body. You may find a deal on one easier before it breaks.
 

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Super Moderator
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Make sure you keep the driveshaft too if the other car has an 8 1/4. The 8 1/4 driveshaft is a little shorter and finding one made to fit is cheaper than having yours shortened.
 
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