[siggyfreud]

Don't sweat numbers matching. They didn't number match trucks. You could verify a truck has the right size motor, but you could never verify that the motor in it was original to THAT truck.

Others have laid out good advice. Focus on the basics to make it safe and reliable first.

Make it stop like you really want.

Then make it handle like you really want.

Then make it accelerate like you really want.

And somewhere in there decide how comfortable you want to make it while doing all three of the above.