Remove the distributor and you can use a small mirror to check for the rear internal gallery plugs shown in post 13. Last year I was able to get the one installed on the driver side with the distributor and intake removed, without removing the engine from the car. My engine stand was blocking access during assembly and then I got in a rush to get the engine in the car and forgot to install it when the engine stand was removed. Low oil pressure and left side valve train sounded louder than normal.