I have had nothing but bad luck with MAC, the #1 primary sweeps across #2,3,4 making it difficult to install the already difficult header bolts.
Choices in order:
1. Kooks (arm and a leg)
2. Hooker super comps (priced fair and have a great primary length for a modular)
3. BBk ( priced best and have a very nice fit and finish)
4. CAM (newer company) stainless steel and I have heard the fit is great.
I tested the first three and the Hookers cam in a little above the rest on a N/a mild build. FWIW