Compression test??

Depending on the Cams specs..overlap etc. the psi readings might not be exactly what you think they should be based on the compression of the engine. They do seem a bit on the low side though. Usually I'd say if all cylinders are within 10% of each other and it runs good, don't worry about it. 89 vs 115 is better than 20% though.. if you are concerned about it, it might be time to have the heads worked over. Did you have the carb butterfly's open when you did the test? That can sometimes make a small difference.