I have been using Holley fuel injection on a 351C for years and I noticed early on that starting when hot is a problem.It will crank fine but won't fire up.
Starts fine when cold.
Believe it or not when it is hot it will flood after a couple of turns. I installed a simple on off switch that can be used to cut the power (positive) to the injectors (the ecu controls the negative).
I switch off the injectors while cranking the engine when hot to clear out the cylinders. After a few cranks they will clear and the engine will fire briefly, then quickly switch the injectors back on before the engine dies.
Alternate problems are the stock fuel pump is rubbish and needs to be replaced. I use a Bosch 044 pump.
If you are using a stock In tank fuel filter (I'm not sure what Panteras have) I suggest replacing it with something built to handle a high volume (stock filters are only good for the mechanical pumps intermittent pumping action not the high constant flow of a high volume fuel injection pump).