I did spring for the competition porting on my 400 Indy from Wilson. It is a very pretty piece.
Why did I do that? The ultimate goal was to eventually have that manifold sitting on a low deck Indy block.
However I found a deal on a World RB block after I had the porting done on the manifold. So that idea went out the window. Would I spring for manifold porting again? I’m not sure? Like Dwayne says. Lots of ways to spend $ in different ways compared to what it costs for manifold porting.
I don’t regret the porting. I know it helped.
Also on a side note I have changed only a converter before and found 2/10ths and 3MPH before.
The right one makes a world of difference.