Clearance issues with starter. There simply isn't any room for the center port to have an elbow fitting on it and clear the starter body:

For my first SBC swap, I used a different bypass plate. With a little clearance work, it cleared everything and allowed both oil passages to be larger and exit the side of the motor.

Also, while you are messing with the starter, get it properly positioned and then pin both the mounting block to the adapter and the starter to the mounting block. Aligning the started with the engine in the car is quite a pain, so a little forethought now helps out a bunch later.


[This message has been edited by fieroguru (edited 05-23-2015).]