Don't know why I haven't thought about it sooner. But, Bullet Cams has a master list of HR lobes, which includes some VERY small spec lobes.
http://www.bulletcams.com/Masters/HRlobes.htm
So, even if they can not grind a HFT spec lobe(less the bevel) on a HR core, you can get a very mild roller cam, ground with your choice of any of the lobes on the list.
"... Roller lobes need rounded noses so the lifter will stay in contact with the cam..."
I never heard this either. I thought the roller lobes were round so that they would have more effective duration, above .050 lift. I assumed that with the high spring pressures, the lifters would stay on the lobes, regardless of their shape(within reason, of course).
I assume that there is a lobe shape, beyond which the roller lifter will not stay on the lobe, passed a certain rpm, with a given spring pressure. I also assume that you could increase the spring pressure to keep the roller in contact with the lobe, at a higher rpm. But at some point, the spring pressure necessary would be too high to be practical.
So, I reckin cam lobes are a compromise. You need the best compromise of lobe shape and necessary spring pressure, to provide the performance and/or longevity, fuel mileage, etc, you desire from your cam. Obviously, all out race engines, HP 500+hp street engines, and daily driver 400hp street engines, will require 3 completely different cam lobe grinds. But, the good news is, almost any grind you could need is available.
But, you may need a custom ground cam to get exactly what you need. I assume that many of the cam grinders charge quite a bit extra, for custom grinds. But, there are probably some who don't charge extra for custom grinds. So, will some of you guys who know, please post a list of all the cam grinders you know of, that will grind a Pontiac HR cam for a reasonable price. Please post info about those companies with whom you have had a good experience, ordering a custom grind. Please include contact info. This may help a lot of guys who read this thread. Thanks !