I want to order a couple of these from Cape International,
https://www.cape-international.com/capeshop.php?parttypes=19&thepart=RP3
But where does one connect the crankcase vent hose when using
these ram pipes ? Does anyone use these and if so, where did you connect the crankcase vent hose ?

Just reverse it and let it hang down this way you can produce a negative pressure at its end.
It is always good to have a COMPLETE plan before purchasing parts for a Healey modification .
Thanks !
FWIW---Keoke
Ed