You will get better quality by contacting the slides rather than projecting to 4x5.
I did this in the past and I would use HC110 rather than D76. I cannot remember the correct dilution

You will need to do and exposure sweep at recommended development time to determine your density
and fine tune adjust your development time and agitation, to determine the correct contrast you are trying to achive for enlarging.

Contact internegs have always been historically better than projected.