1970 hemi duster build hotrod magazine 2007

IMHO: better off sticking with what it came with. Contact the original electronics company and see what they will do for you. They may be very generous with help since that build helped put them on the map. You seem to have loads of paperwork to back up that build. It would be a shame to change that part of early hemi swap history.
Again my opinion…. I also believe in aliens. lol.