/6 to V-8 swap question

There are lots of different ways to accomplish this task. Working on a slope is not impossible. Safety is the foremost concern regardless.
I'm sharing my approach just for consideration. Scafolding bases make very steady 3 leg stands. A piece of 5 inch channel iron cut 4 inches long welded to the top of each makes a perfect clip for you cars subframe. You would need 8 of them. 4 each of 2 different heights. Example 4 inch slope, 4 stands at 20 inches tall, 4 stands at 24 inches tall.
Jacking the cars high enough to get these stands underneath isn't easy. Hiring a boom truck to lift the cars for you is easy.
Once both cars are ready for wrenching, the only problem remaining is tools rolling away LOL. Every part you want to swap drops right out from under both cars.
I use a trans adapter on top of a floor jack. The jack will not roll in dirt. To solve that I have a half sheet ( 4X4 ) 1/4 inch checker plate or tread plate. The jack rolls click to click on this plate to right where I want it and stays there.
Scrap metal prices have went up since I purchased these materials but they are still here to use again and again or sell at a profit.
I've also aquired a large piece of plastic that was once the wall of an above ground swimming pool. I can drop anything from a starter to and engine on it and slide it like its on ice.