Re: high temp wire sleeves?
Get a pair of tin snips and have at a Campbell soup can or the neighbors mail box...
(I keep running my neighbors down, and they are starting to pile up! [img]images/icons/tongue.gif[/img] might as well use them for something!)
Make a heat shield for the wires.
Attach it to the exhaust manifold, with two or three inches of air gap between the exhaust manifold and the new 'Heat Shield'.
If you are REALLY tricky, you can use a wire wrap clamp (proper term: Adel clamp) to hold your wiring loom up off the heat shield, giving you another air gap!
Unless you just have a pocket full of money you just HAVE to spend...