A couple of queries.
What material is the part to bw cast from ?
Why split the part ?, would it not be easier to sink the part 0.24" deep in 1 half, and a flat face on the other side ( you may get flashing dags, is my guess why not )
-create a rectanglar solid ( same dims as the 2 dies put together ), the Z zero to represnt the split line.My ultimate goal would be to create the top and bottom and have them meet perfectly in the middle where the parting line is. I do drill two holes for alignment but so far alignment is far from perfect.
-place the solid part inside this rectangle, make the split line lay along the Z zero line, and do a solid subtract -rectangle 1st then your lever
-create 2 circles in TOP view, (for the alignment pins ), now solid extrude those circles, ( select the make cavity option, and both directions, through all ), and take them away from the rectangle.
-do a "solid slice" on the rectangle "by plane" at Z0, select "keep all"
result= one top and one bottom die, alignment method done, all you have to do is machine them