If I understand your symptoms right, the starter turns the engine over fine, but it won't crank up when hot. My bet is that you have a low voltage issue going to the Sniper system. In the condition you are describing, if the radiator fans are variable and on the high setting, they along with the starter draw, this could be dropping the voltage too low for the Sniper to run. I have run into this exact same scenario before where the engine fires fine when cold but has an issue starting when hot and the fans are on, especially if you're getting the Sniper voltage through the ignition switch or off the fuse box.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs
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