Hello, GT@50 sanJust spoke to Ford, NLA. Talk to engine builders as they've dealt with 5.4's with a seal groove in the crank plenty of times. M2K Motorsports and Heffner might be helpful.
Thank you so much talked to engine builders.
If there is any improvement needed on the crank seal part, I will contact them. I am very grateful for your kindness.
Best regards,
Hachi