Insects and minor problems aren't going to cause your brick to heat unless you are running it hard, like WOT up a 20 degree incline for 20 minutes or something.
Sounds like a failed water pump, although the fact that hot fluid is moving to the core in the dash would seem to rul that out (you did check the pump first, right?).
Ah, wait, I know what it is. You didn't replace the t-stat properly, or you didn't fill up the head first and now have a giant air pocket in there that prevents the t-stat from getting heated up (no liquid against it). if the t-stat doesn't get hot it won't open, and if it doesn't open hot fluid will simply vacate the head and you will overheat quite quickly.
Take off the t-stat cover, fill up the head as far as possible without overspill, fill up the rest of the system as far as possible (hold the hose to the t-stat housing up to get it nice and full), quickly connect the housing to teh head and bolt it down (put paper towels undeneath to get and overflow). Start and run normally.
BTW, if the car even goes borderline red I would suggest you turn iut off immediately. You are going to warp the head if you aren't careful.
-rt
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