Opinions on this Custom Comp roller cam, engine combo

That cam is smaller, and has quite a bit slower lobes than the UD 259/264-108, .651/.651 roller I ran in my old 9.7:1 906 headed 448........which btw was much mellower/better behaved than the MP509 cam.
And....... he’s going to have another 40+ cubes to use it up.

With the slower ramps of the OP’s cam....... it’ll still be kinda lumpy at idle though.