Gathering knowlege before tear down.

[JPsChevy]

I have a 68 c10 for my swap, I have a lot lined up but I'm running into a few questions that I can't seem to find answers to. I'll list my questions and what I'm working with. I ask that no one comments on the trans being weak as I am not drag racing. I'm Just building a driver that gets good fuel mileage.

99 4.8l engine was mated to 4l60e have full engine harness and pcm (4x4 truck)
06 nv3500 out of a 4.3l v6 2wd truck (have whole truck)

1) When repinning my harness, how do I accomodate the manual trans into the harness that originally was on the 4l60e? Will I have a nuetral safety?

2) Is there a simple pedal solution? I'd like to keep more original looking vs the plastic 06 pedal with the cupped ball for the slave cyl. reservoir.

3) Can I run my stock oil pan?

4) I have electric fans out of 06, will they mount to stock radiator? Will my radiator even work being the 68 is a 6cyl truck?

I appreciate any and all information I can get. This is my first ls swap and I know I'll run into more questions.
Thanks
~JP