I need to get my truck safetied and the reverse lights don't work. It has a c6 and I noticed 4 wires coming out of it that were cut off. Which wire is for the reverse lights?

The upper u joint on my steering shaft has play and I want to replace just the u joint part. I've looked online and I'm not sure which universal to get.

Wanting to rebuild my 351m out of a 78 f100. What should I do for a performance upgrade? Making it a 400 worth it and if so how to do it? Already has edelbrok carb and intake with dual exhaust and headers.