Looper or cross flow

[James butcher]

Hell everyone,
How can I tell if I have a looper or cross flow?
No model # available. I narrowed it down between an 1987-1990 year model. Thanks in advance. See pictures.

 

[McGR]

90° Looper

 

[Chris1956]

A crossflow will usually have removeable transfer cover plates on the side of the block. Loop charged motors do not usually have those.

 

[racerone]

Loopers do not have transfer covers.----The crossflow has those covers to allow drilling of the ports.