What Camshaft

Did not camcraft (the one in the south with the old timer) do early Direct Connection cams and maybe even the factory masters?

let me splain a little more
you CANNOT take a flat tappet lift curve and put it on a flat flank roller- cant be done
you can increase the duration
trying to do quicker ramps on a flat flank roller increases the side thrust
this is one reason for the larger roller wheels and larger cam cores and base circles on custom blocks
the grinder has to pick how much side thrust he is comfortable
the way you make it work if you have the capability to generate profiles to the N'th degree is to undercut the flank
gets the lifter pushing up more and sideways less
you can get a similar lift curve with around 8 crank degrees less duration- again depending on where you want your tradeoffs
now you do not have to use all of this 4 degrees on each side to go balls out acceleration
you can back off the opening and closing to be more gentle and still have a powerful lift curve
That's the result of all the work Mike's dad Dick Jones and Brother Rick and Mike did on some high buck cam development programs
Special Indy engines, etc
NOw, granted, others can have a slight inverse by using the smallest wheel their auto CNC cam grinder will allow- they go by various names
not the same as a super small wheel
comp has some
Engle has some smaller wheel grinds ( i do not know for sure who did the masters but Dick Jones and Jack were said to be tight, as they were with Ed Winfield

I have no Idea how much Crower's INRAD grinds are inverse and if there has been any recent development
and some (not to include specifically any of the above) could not get rpm from their inverse radius attempts
It took a lot of R&D
Bottom line is that there is a mechanical advantage to using an inverse radius flank profile
There is a recent post by Aj where he states that 7 degrees made a surprisingly big difference
we advance cams 4 degrees to make a difference
the difference between inverse and flat flank can be huge
and if you were running one would you tell?
No you put a sponsors sticker on the car :)