You have a few options depending on what you want to do.
All options can control fuel and spark, all options can be tuned anyway you want. Hell even a small microsquirt (size of a credit card) can do that 408 just fine.
Do you want full sequential injection? That puts the lower end options out the door.
If it were me..... I would get a ms3 and go full damned tilt. But for a simple fuel injected build up an ms1 will work perfect. Most of us who run the pnp for the stock harness (myself included) actually run the microsquirt it's what controls the ems.
A sweet look would be a efi Victor Sr intake with a 4150 tb on top and an air cleaner, use whatever ignition system you want we can control it. Any sensors you want we can program them in.
Or we can do an ITB intake.....
Ms3 pro this link is for one of the options way...... overkill. 8ft harness
https://www.diyautotune.com/product/ms3pro-evo-standalone-engine-management-system/
Ms3 fully sequential everything, you can use an ingnition module or self ignitor coils for full sequential ignition.
This option is under 800$
Ms2. Basically what the rest of us use. Batch fire fuel and wasted spark. Can be done for under 550$
Ms1 can be used but to be honest I would use one of the other options.
The only cavat is the fact you have to wire in the harness, but diy sells all kinds of options new. Or if you do like I do a smart JY dog can find what he needs on the cheap.