Digital Tuning Anyone Use Fast Ez Efi Multiport Kit On A Fox?

What does the system you are looking at cost? Got a link to it?

I only ask because I do tuning on megasquirt systems, alot of the guys here use them. With you just running NA it would be simple to tune with and there is even a full help thread on here.

A plug and play setup that uses the stock harness and sensors including the TFI distributor can be found here.
https://www.diyautotune.com/product/megasquirtpnp-g2-eec4a8-for-86-93-ford-mustang-5-0/

You will need to purchase a wideband setup to get the full potential out of any system. I like the AEM setups.

Stinger performance also has a pnp unit that utilizes the same tuning software.

These do full fuel and timing control, they can also be setup to run Mass Air if you want that as well.

No problem, I run the help thread here and can supply a base tune and tuning support.
www.stangnet.com/mustang-forums/threads/steves-megasquirt-tunerstudio-help-thread.888730/

This system can almost tune itself once the base settings are finalized. (Even the best "no tuning required" systems lack drivability) fear not we can help.

I also offer complete tuning but that's not free. nor is it expensive or necessary for a simple na setup. Some guys need alot of help because of boost or custom setups.