Thanks for the input.
Yes, I still have the Nova proportioning valve.
I was told that the M/C has no residual valve, but the proportioning has the proper valve for disc/drums.
I think a trip to the Chevy Parts Counter and a look at the exploded view of the M/C and P. Valve may answer a few things.
What is concerning me is the pull to either side and not consistent Although it favors the left the most.
I was thinking of backing the rears way off and see if that has any effect. A rear brake that grabs will pull the front over. ( I think)