[Blackbirdws6]

My big recommendation is to spend the extra money to have the engine run on a dyno as close to the configuration as you plan to run it in the car. This will ensure you get it broken in properly and prove the combination is doing what is intended. It will give you some piece of mind to know the engine is sound so if you have issues when installed in the car, it's likely something on your end isn't right.

When selecting the final engine spec, think far down the road how you will plan to use the engine. Do you want something to provide max power or sacrifice a little top end to gain more mid range. Ask for the complete build sheet including part numbers should you need to replace anything down the road. Ask what plugs should be run for different conditions or if not wanting to make it complicated, ask what plug and gap should be used to handle both NA and nitrous.

Ask if after the engine is broken in, do you need to check over head bolt/stud torque, etc or not needed.

Ask what oil they recommend for break in and after break in use.