Actually, when I replaced the mono springs in my '67 with new Healy springs, the resulting stance is just like you describe.
I was a bit unhappy because I wanted the OEM stance.
I replaced the rear multi's on my '68, and that resulted in the correct OEM stance.
So you may be better off staying with monos. I purchased both sets of springs through NPD. They were cheaper on Healys than buying direct from Healy. (go figure)
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold