Back in '77 we ordered a grate 427 from GM, 7 months later my brother and I moved to Ca, and had it delivered to us in Ca. Yes it took 9 months to get it. We were told it would only take 10-21 days to get the motor. They said that they needed to make more pistons to assemble it! I don't know about now, but back then you had to pay for it in full before they would order them. But now we lived in Ca and sold the car before we moved!
After all the waiting We put a full frame into a '72 Vega and made a Pro Street out of it. and bought all the parts including the flywheel got it together and to fire it up, and it shook like hell! Took it a part and checked the guts and they sent us a 454! And then they wouldn't exchange the flywheel because it was now used, or even give us new gaskets. Because we bought the motor from one GM dealed and got the flywheel from the one in Ca, where the motor was delivered to!

Pat