Rubber valve seal lengths . 273charger

time to replace valve seals on the 1965 273 dart charger engine. question is >>
what style umbrella rubber seals go on the oem 65 273 commando head?
I did not pull them out yet to see what style is in there.. My over haul gaskets sets have two different length rubbers seals for that engine .

one set that is approx 3/4" length and the other is 3/8" length ( shorter ). what size goes on which exh and int valve?
the engine is smoking pretty bad so I pulled the vlave covers off and looked inside and there were pieces of hard rubber seals all over the place.

Thanks for your help guys !