Help! Small block 360 has a knocking sound

Cudafever said
My money is still on the flex plate.
loosen you torque converter bolts and remove them. make sure that the converter will slide back into the transmission.
should have about 1/4 or more clearance between the flex plate and the converter.

Make sure the car is facing uphill so the converter stays put and START IT UP.
Its only going to take 10 sec of run time to know if it there.
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That is a good test Cudafever, going to keep that one in my "Diagnostic Tool Kit".

Thumbs Up ! . . .

Oh Wait . . Won't start without the torq converter with ring gear bolted to the crank shaft.

Good attempt though . . .

76 360 727.jpg
360 external balance converter as example.