Yes and sometimes you can get the neg issue corrected without longer upper arms but you need to pull the non slotted washers off the forged lower A-arm mounts--that helps. If it's still negative, longer upper arms will be needed. Been extending them for many years now because twisting the car apart with the adjustable camber bar between the shocks just did not work for me.
Was answering and post an it vanished like my money when the wife goes shopping.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.