Well, I should provide an update.
If you purchase the Hyperspark Distributor for a 383-400 Chrysler, please measure the mounting surface to distributor shaft tip length. Chrysler OEM is 3.5". Hypersparks were being built in the low-range tolerance which only allows the tip to seat into the distributor drive gear 1/16", OAL from mounting surface to distributor shaft tip being around 3.375". Holley will correct this mistake, free of charge.
Update two, updated both the ECU and handheld FW, re-ran the Wizard on the Sniper EFI.
Looked on the Holley forum, well, it's not exactly like the video if you don't have a 300-HP Chevrolet. Instructions say, drop in the distributor when the #1 piston is on the compression stroke @ TDC, finger on the port, blows it off, TDC is right on with the balancer. Okay, move on to step two. Drop in the Distributor, place on the clear cap, rotate housing until the cap seats. Mark where the clear cap is cut to show where the #1 spark plug is located. Install cap and spark plug wires, update the firmware, and you're ready to fire it up (according to video).
**** REALITY ****
Now, disconnect the fuel pump power, loosen up the distributor hold down, with a friend, grab a timing light, spin the engine over while verifying if the timing is 15*, if it's not, rotate the distributor CW/CCW until its set at 15* during cranking, and tighten it down. This is a critical step, wasted a lot of time because we didn't do this. Installed just like the installation video, car wouldn't start, would fire off after five seconds of cranking and die immediately, only reason it would attempt to fire is I had the throttle wide open and the (cold start) primer fuel dropped into the cylinders. Checked power at the coil, power at the distributor, verified the coil was providing spark, everything you do when it's not lighting off.
Started rotating the distributor housing, finally got it to fire off and half-way run with the timing being way off and were on the verge of carbon monoxide poisoning from the un-burnt fuel. Have a timing light ready, must verify the timing is correct when cranking and when it starts, there is a procedure to do so. Would have been a prime candidate for a Road Kill episode.
Should have actually read the complete instruction manual rather than relying on the install video! Verify timing before trying to start the car, biggest takeaway here. Leave the default timing settings in until it starts and runs.