Here is a cheap fix for the Chevy starter blues. The starter is fine usually, but the solenoid gets hot and can't get enough amperage to crank the engine fast enough.
http://www.oldengine.org/unfaq/solenoid.htm
http://www.streetrodstuff.com/Articl...tart_Problems/
http://www.maliburacing.com/starter_solenoid.html