Yes!!! It gets complicated!
I have an all OEM ported 066 flat top. I have an OEM 066 round top with a Cross P+C on it (not ported) that was in the HL Supply video. I have an Asian 660 that had an OEM 066 jug on it, I pulled the jug, plan to port it, and put it on the OEM 066 chassis.
At the same time I will pull the Cross P+C, port it, and put it on the Asian 660 chassis.
I also currently have 2 other Asian 660s (both with port work) and a ported Asian 660 Big Bore.
I also have an OEM 660 jug I may play with. The 066 flat top plastic has an opening for a decomp, but it currently has a non decomp jug on it, so I may change that if I like how the 066 (decomp) jug runs!
Of course, my projects always go on the back burner when other folks bring stuff for me to do. I did some performance enhancements (not port work) to an 066 round top and a 12 mm 044 for some guy, and he loves them both, so he purchased another 066 with a burned piston and dropped it off with me! I've been finishing other projects before starting it (which he was made aware would happen). I also have 2 folks who want benches … I guess it is good to be busy!
Keep in mind, I also have to keep up with my real work! The days just ain't long enough any more!