Good luck with this build. I have a pole barn for my horses in SE Wisconsin.
1. level it off, but don't "count" any fill as part of the measurement for depth of the post.
2. 4' down from the finish grade, as Bondo stated.
I have a well with very hard water. I soften the water using the double garden hose filter with a water softening filter and a sediment filter from here
https://www.purewaterproducts.com/garden-hose-filters
I "recharge" the water softening filter by backflushing with salt water. The cartridge...
Among other things, I need to change the starter. The LT5 engine is a DOHC, so the starter is in the valley, and a lot of stuff comes off to get to it. So, while I"m in there ... :D
The tent arrived today, and we got it assembled and in place. Preliminary tests are positive :thumbup:
I won't have time to really work on the car for a few weeks, but I'll report back in after I do.