Very solid numbers for such a small cam, showing that you used the given parts to their best!
Looking at the cam specs I have got a question (kinda stabbing in the dark): isn’t is usually said that the Magnums have a good exhaust port that doesn’t need a lot more duration, if any, than the intake?
I noticed that your other 360 you showed recently (?) had like 224/224° duration and made very good numbers (with different cylinder heads, I admit). So does the Cheepy really need the split on intake/exhaust … or was the cam just one you had on the shelf, or could it have made even better numbers with a ‘square’ cam?