That is the cams i run in my SSS 272deg and also run adj cam gears.
Although completly different engines and what not i think you'll find them decent on your N/A setup with a decent tune and cam timing done.
On mine the cam timing needs to be done and it still needs a tune and as it sits now really picks up from about 3800rpm right through to redline.
Hoping to get that down a bit around 1000rpm lower would be nice, but with the overlap on them kinda makes it hard need dyno time to play with the timing some more.
Cannot tell you what sorta power gains i got from it as i did a whole bunch of other stuff at the same time like a full forged rebuild and what not.
I would expect on a N/A setup around the 20hp mark gain yeah. The idle will sound awesome had mine lumpy before it now sorta sounds stockish with a bit of a rumble at idle.
Interested in seeing the results.
SSS_Hoon