New clutch setup won't disengage

Firstly, you won't hurt the ring or pinion with the starter (If I understood that correctly)
I had a car that sat do that once and I blocked the pedal down and reached in through the fork opening with a long screwdriver and popped the disc loose, and everything was fine after that.
In your case you may have to pull the clutch out and reassemble it if you are not comfortable or able to do anything else.
Thanks.
I can do that, if I can bend a tool sufficiently to reach in through the fork hole. REALLY don't want to remove (Lakewood, BB A-body, headers).

Personally I'd be tempted to warm it up a bit to make it more agreeable then roll it out in the street, put it in gear and fire it up.

That certainly would work too, but jacking the rear end up means I'm not taking off down the road in a car that hasn't completed its shakedown and has no windshield, bumpers or lights :D

I'd try that as a last resort before pulling it and reassembling.

I had to drive a car through town and about 15 miles home with a broken clutch fork once and I basically did it this way.

I've driven A833's that way with a broken clutch pedal rod, too. And sometimes float the gears (without using the clutch) just for fun. Get the rpm's right and it just falls in.

What you want to do is fire it up in gear with the clutch in and jump on it a little.
It'll come loose if it's just stuck, but won't if it was an assembly problem.

That's basically my plan. AFTER I make sure I have enough fork travel...