I was going to ad this earlier but I didn’t want to derail your thread, speaking from experience, I would do overdrive over efi. I did over drive conversion on 2 old cars and I found I drove them way more after.
I did OD several years before EFI which was several years before boost. I strongly second the vote for OD before EFI if you need to do it in stages. My Charger still runs a 750 double pumper but has a 5spd in it. I have no desire to put EFI on it, but the extra gear was 'mandatory'.
