So I have finally reached point of no return (kind of at least

)
The engine is now out of the car and along the way I discovered some more peculiar stuff.
You could almost believe there has been two persons working on each side of the car with different suppliers

For example, the dust shields on the discbrakes are of different make, the motormounts are new but of different make on each side, there were used different gaskets on left and right exhaust manifold....... but more probable is that it is a "we take what we have and get this together quickly now" car

The gaskets are interresting by the way, on the drivers side they used Mr Gasket 254G and on the passenger side they had used Fel-Pro 1442 and for me as a newbie it was real interresting to see the difference in matching with the heads.
And now time for questions.
1. I'm putting together the shopping list and I just wonder if there is any reason to change out the flywheel in a 500hp 445 build if there are no visible damages to it?
2. After reading on various sites regarding piping diameter I have come to the following conclusion; pipes are measured in inner diameter but tubing as in fuel and brake lines are measured in outside diameter which means that my fuel line which meassures 3/8 inches outside should be a so called "3/8 line" and be good enough for my build. Am I correct or is this a standard 5/16 line (with 3/8 o.d.)?