I just put a set on a 10.5-1 - 340 w/a XL285HL on a 108. I’m a little ways from start up as there are other issues stopping me.
Ops… (EDIT….) I swap out stock port Edelbrock heads for these knock off’s. ProMaxx’s CNC job does leave some port work on the table but yet gets some good numbers out of them. The power gain even with the same cam was very good.
But yea I do like everything that it came with. I did do some work on the spring seat area for matching valve springs to the cam being used.