Yes, that is the reason to vary from the Shop Manual settings.
But, let me say that my experience in adjusting the 289 series (302,351w) and 351c series (yep Boss 302, too) with both solid lifters and hydraulic lifters with hot street cams up to around 246 @ .050, the shop manual is fine and accurate.
If it works for roller lifters, I don't know.
If you are in doubt use Dan's method to be safe.
If you are using hydraulic lifters or even a stock factory performance hydraulic cam, I just don't see where it is going to matter at all.
I wouldn't bother with the longer method in my shop and I would guaranty the work, but that's just me.
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.