Going to re-build the engine in my cobra despite its 71k mile odometer reading. Was wondering... What is the best most complete kit? I've seen kits ranging from 760.00 from summit minus a new crank and rods to kits at Sean Hyland costing 2699.00. Does any other reputable company offer a complete or almost complete kit? How important is it to replace the timing chains,guides and cam gears? I'm planning on throwing about 15-17lbs of boost at this engine with 8.7:1 - 9.0:1 C.R. Any help would be greatly appreciated!