318/727 to 360/727 eng swap torque converter question

haven't used them in years.. they are for cast crank external balanced motors.. theres a template that shows ya where to weld them on..

i'm not sure you need them for your 408.. sure the 408 isn't internal balanced?
. No it's not internal balanced BluePrint says I need the 360 hb and tc, plus the thing vibrates like crazy.