You ought to try contacting Congregation Torat El in Ocean, NJ. It is the successor to 3 congregations including Temple Beth El, a conservative congregation which originally was located in Asbury Park. Beth El, including its cemetery, was organized in the 1920’s and the cemetery still exists. The synagogue’s phone no.: 732-531-4410.
There was also was/is an orthodox synagogue in Belmar, NJ, close to Bradley Beach, known as Congregation Sons of Israel. It was organized even earlier than Beth El. I don’t know whether they had/have their own cemetery. Phone no. 732-681-3200.