Updating early 904 - is this a suitable donor?

Was lucky with no vibrations - the converter hub still looks like new.

I wondered about the 999 - but don't really know what the difference is - or when they phased them in. Not sure how I'd identify the lower 1st gear.

Got the one from the yard further apart and it all looks ok - except for the burnt clutches. It has 4-gear planetaries where the '66 had 3-gear. I think I'm just going to go through this one and call it good.

I don't think it's a lockup - have the converter with it and don't see anything out of the ordinary. I read that the 727's with lockup had the end of the input shaft machined smaller - don't know if the 904's had the same -but this one is splined right to the end.

Thanks for the replies - time to start cleaning parts!