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Yes it is. Can’t afford a new cylinder at the moment
Major oof, not a good idea at all to run the niche. You'll end up spending significantly more in the long run, with an uncomfortable chance of a catastrophic failure causing significant lower end damage. Then you'll be spending thousands rebuilding the top and bottom end, trying to find case halves etc. We'd all hate to see all the work you're putting in go to waste because you didn't want to spend a couple hundred on a proper OEM cylinder.
 

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If I went with 3 can I run stock springs or do I need HD springs
A lot of guys complain about losing tons of low end with a stage 3 cam. To combat this, they'll recommend a minimum 11:1 piston. But that can create another problem...the stock connecting rod is a common failure point when you increase compression.. Not good! Given the age of the 660s, you're taking a big risk if you don't replace the con rod.

I know you've put a lot of time and effort into this thing, but playing a bit of devil's advocate, I'd at least consider getting this thing running and sell it, then buy or finance a nice fuel injected 700. You've got to do a lot of modding to a 660 to get it even close to par with a 700. Just something to think about. I loved my 660, but selling and getting a 700 was absolutely worth it.
 
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