Hey y'all, thanks for all the comments and suggestions. The problem is definitely related to heat, as the fuel system is working just fine, and like I siad..when the starter is cold it cranks away! In fact, I've also experienced a couple odd occurrences when starting the engine. What has happened twice over the past 5 months is that when the engine starts, the starter doesn't stop cranking...even with the ignition off and the key out. You have to jump out and and disconnect a battery cable to stop it. Reconnect the cable and everything seems back to normal. Any idea what THIS might be?
Oh, yeah...one of you mentioned "mid-length" headers. How are these different from the so-called "shorty" headers...or are they the same? Who makes them?