To be honest with you I have no idea. I haven't messed with too much alpha stuff. Had a 22' Chaparrall with a 330 Tempest and alpha that had no cooling issues. I do have a restrictor inside the bypass hose to the thermostat housing. It has a 7/32" hole in it so most of my water is sent through the engine.

You don`t need an additional box to run coils.
HP and Dual sync is all thats needed.(and a couple subharnesses)

Even if I am not running coil over? Just single coil using the distributor to supply spark.

Oh, I thought you were doing coil/plug.
Not sure on that then..I`m running 8 coils.

I do believe you will need an ignition box to fire the coils. Crank signal from dual sync goes to the ECM, ECM triggers ignition box, box fires the coil.

I'm assuming the ECU fires some type of "smart coil" that kinda has a built in ignition box?

After doing 15 mins of research they are a "smart coil" that does not need a box. But it appears Holley has a coil driver module to drive a regular coil.
https://www.holley.com/products/fuel.../parts/556-150
Page 35 of this PDF
https://documents.holley.com/199r11031r.pdf

Go coil per plug.
Better hotter spark, you can control individual timing on each coil if you wanted to .. I run a dwell map based on rpm... no need to fire those coils on full blast at idle..helps em live longer.

+1 on the coil for each cyl. if you can swing it, I would think it makes a lot of sense!

You guys are better at spending my money than I am. lol
I'll start looking for the best pricing on some D-585 coils. They seem to be good to 15# of boost. I'm under 600HP and NA.