I have done a ton of these and agree right around 220@.050 is the sweet spot for a LM7 5.3L. Might see a little higher pk hp number up around 230 but tq and power under the curve will suffer. Also that head likes the higher lifts. You can run a shorter duration on a tighter lsa and get that BIG cam sound without the BIG cam soggy tq curve. A tight lsa will generally help power everywhere on the lm7. I do a lot of custom 218/221, .58X, 108 lsa and 221/224, 108 lsa and the guys love them. A few have been deep to lower 12's on a well set up truck. We even have one turbocharged lol...

 

I'd follow that advice above if I were the OP


By the way, the setups in your sig sound bad ***.

And lol at having a turbo truck on a 108 LSA cam

 

i have tested 231/239 cam on 5.3 it was like what stock48 says , loses everwhere but great top end power ,

with tbss intake 90tb 799 heads it made around 362hp 34xtq but that cam was slugish af