requesting real life experience with 904 lock-up with manual switch

No problem Mike.
@str12-340
I am running exactly what you are talking about in my 67 barracuda convertible,
273 commando , lock up A998 mid 70's non electric controlled with wide ratio gear set and a 2.94 rear gears.
Pulls out with same low final ratio as 3.23,
Has a slightly longer tack drop between gears but is hardly notable, high gear still 1-1 ratio but lock up drops rpm approx 200 rpm at a 50 mph apply and drops out on its own when road speed drops or if kick it .down.
Whats not to like? Works great but didn't plan on building a drag car, mileage and cruiser.
Lon.
Pm me if you have questions.