Re: 94 DS, spark, fuel and compression, wont run
Not to dampen your bigblock ideas, but a sheared key is quite an easy fix (once you can get to the flywheel), if that's what it turns out to be. Easy to check with a timing light without removing the motor.
'Progressively worse' could be the flywheel continuing to move on the crankshaft and put the spark timing farther and farther away from where it belongs.
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