I doubt you’ll see any trouble. Most of the cam manufactures machine the groove into the cams due to the fact that there is many more applications that calls for it. When I was building my engine I used the grooved TA cam bearings. The fact of both cam and bearings being grooved give me concern of oiling problems. I decided to take the cam (billet roller) to a machine shop, where they submerge arch welded the groove and turned the cam back to specs. By doing this I feel like I corrected two problems, 1) being oiling issues, the other being load bearing area/surface on the #1 journal. If you are not using cam bearing that are grooved, I wouldn’t sweat it. BUT I would advise of a good quality cam bearing if the original GM’s are not in there.