Sorry, no sale on the cam.
That lobe is a roller tappet only, designed for a very big roller tip (.9375" OD, not made for automotive apps TIKO). It might not actually be damaged by operating against a mushroom, but the curve area will be way down, and the accel/vel rates will be all over the map - not a good idea.
If Delta has any VW Type I (aircooled flat 4, 1600cc etc.) profiles, these are all suitable if the timing figures are bumped around. I'm not sure if their GMC profiles for the original tappets are actually based on the .990" tappet, or just a borrowed SBC .842" profile (very common), in which the VW tappet would be a lot of work for no change in valve action.
Remember to tell them your rocker ratio, since VW cams are normally made for the original (much smaller) ratio.
