Mark at BAM has a MSRP price for $149k Engine and #6 Drive and $100k Bobtail.
It also states the following...
"these are Factory list prices for reference only, we offer SUBSTANTIAL DISCOUNTS ! Contact us for your actual cost on any MerCruiser engine package or base engine. Most Mercury Hi Performance engines and packages are in stock for immediate installation or shipment. "
So the serious buyers would know the real market price.