What do I need for my 904 rebuild?

I'm going to pull my transmission shortly and would like to have an adequate rebuild kit on hand and have to say, I really do not know what's the proper choice for this venture!
Also I realize there is an unknown here but the 904 was shifting smoothly before the tired engine gave up.

I've tried to piece together various threads on that topic but am having difficulty consolidating a parts list. The 904 is in a 65 barracuda w/273, but will have a mild 318, 95% street driven & will be "tested" from time to time for sure!!

I prefer a fix it right the first time if possible to avoid having to make multiple mail orders for parts or another rebuild in the near future!

The standard shift pattern will stay stock but will have a shift kit (another undecided)

A retired "mechanic" acquaintance of mine says he has rebuilt many in the past and has offered to assist me. Also he says he has kits from way back when but I don't know "what" he has..freshen up, rebuild deluxe or master kit, ect.!

I doubt he has the parts to make a stronger tranny that many here seem to pursue.

Any recommendations or suggestions/key pointers?

Thanks in advance fabo!