Considering a 5.9 EFI swap into 68 Val -833 O/D car

I'm running a reflashed 1998 factory Dodge Ram 2500, 5 speed ECU in my 68 Barracuda convertible. The same ECU was reflashed to run my previous otherwise stock 5.9 with a bigger Hughes roller cam, headers and bigger injectors.

Recently I reflashed it for a fresh 408" motor with ported Eddie headed, match-ported Airgap intake, Hughes Big Gulp throttle body, 10.25 to 1 compression, with even a bigger cam and injectors.

Same ECU made both motors run excellent using a Hotwire Hotrod harness. I went with a guy named Sean aka Hemifever for the handheld programmer and tunes. He's good at what he does! Fresh tunes are emailed to me, I download them into the handheld tuner and upload them into my ECU. I send him a video clip of the wideband readings and the car driving on the road from cruise to full throttle and he tweaks the tunes to optimize them.

It's as plug and play as it gets. If I went aftermarket, I would use the Holley ECU's.