The only porting templates I’ve ever had my hands on were the DC ones for stock BB heads.
They only addressed what to do in the bowls.
On most aftermarket performance heads, they bowls aren’t in need of much work.
Many are already technically “too big”.
Additionally, the SSR is usually already a big improvement over the factory head it’s designed to replace.
There isn’t often a lot of easy “low hanging fruit” like there usually is with a stock head.
My experience has been that it takes a fair amount of whittling to get a SBM RPM head to 280+.
And based off the results so far on the head featured in this thread, I’d say the SM’s do as well.