At the risk of sounding repetitive ............don't do it !
As a former vette owner, I still have a fondness for them, but they're ten a penny .......
An independent Mercedes shop will save you money, if you need it, after the warranty runs out, and why would you ever need a 12 grand shortblock when low milage motors are all over the internet for 2 grand.
Vette parts are not 'that' cheap anyway...... Unless it's a C6 Zo6 ................