Nailhead trans question

I have been looking around and have not found the answer yet so figured I would ask here.

I have a 1364705 Nailhead and a spare I would like to run a Th400 behind it I found that the number above is for a 64-66 401. Does anyone know if this will require any type of adapter or will the trans bolt up to this engine?

Thanks for the help

 

no adaptor needed if you have a nailhed bolt pattern trans.