Updating early 904 - is this a suitable donor?

I have rebuilt numerous torqueflites over the past 29 yrs. and I can understand your dad's concerns regarding shift improver kits as many create more problems than they fix. In the early days I ran into problems using other brands of kits but the one truly reliable kit I have used are the trans-go kits. I never discovered them until 93 and since then I have never had a problem with one and they do exactly what they say so they are all I will use. If your looking for just a mild reprogram that will make the shifts a little firmer and make the trans last longer the TF-1 is the kit for you.