I assume the engine is a low compression 454 with around 7.5:1 cr.
So, with a blower cam (wide lsa) and a later intake closing point from a bigger than stock cam, I would say 95-110 psi with a compression gage is about right.
Furthermore, compression gages are not known to be accurate. I have 2 gages that are the same make and model and one reads 20 to 30 psi more than the other one. But, the difference between cylinders is what you need to look for, no so much the number.
Maybe the header evac system isn't working or the rings haven't set yet??
Tell us about the block prep, pistons, and clearances used.