I assume you are talking about the oiling system. They make a tool for such an operation. It is a long shaft, that looks like a standard screwdriver on one end, and goes into a 1/2 drill, on the other. This shaft goes down the motor where the distributor would go, and matches up to the oil pump drive. Pump the oil up until you have oil comming out of the pushrods, and the rocker arms. Your oil pressure gauge in the car will also be an indicator.
The 400 Chevy is a small block engine. The 400 BIG BLOCK Chevy does not exist! 402 big block Chevy does. it seems in the early 70s Chevy put 402s in their pick ups and they had 400 badges. this opened the can of worms known as the non-existant big block 400.
yes
Yes.
1,8,4,3,6,5,7,2 all small block and big block firing patterns are 1,8,4,3,6,5,7,2 for Chevy
Chevy to Chevy...yes.
It is a small block
Yes it can, you will also need the big block pickup tube
no
It is a small block.
no
No, they did not. The smallest big block Chevy is the 396. They also made a small block and big block 400.
right below the heads