Clutch Questions - Help Identify & Disassemble

[Brentd27]

My Hustler had a driven clutch that I have not been able to identify. It's possibly a Salsbury 850, but I can't confirm. The only marking is the number "703219-1" stamped on the side that would be against the transmission. The spring has some bits of Yellow paint remaining on it. I removed a snap ring / circlip from the "back" side of the clutch, but it still wouldn't come apart. Not sure what I'm doing wrong.

Questions:
What brand/model is this clutch?
Is it set up for 2-stroke or 4-stroke?
How do I take it apart?
Would it be appropriate to mate this with a Comet 780 drive, and if so, what spring do I need?

Pics:
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