Something to consider- get your engine back from the machine shop as is. Buy a shortblock with the cam of your choice from Muscle Motors or CME etc. Install your Indy heads, intake pan etc yourself. If your current block is trashed due to a spun cam bearing, your going to be right there price-wise it would seem. At least you will have control of this bad situation and get your car on the road. If this machine shop is 3 months plus back logged, their price will reflect that if they ever get to it.$$$$$ I'm not sure of the logistics here, just throwing out an idea.