Well, a few reasons on the Streetmaster. One
The small ports worked well in the days before the performer dual
Plane was out.
The second for the era I want this engine to look like, it’s a better fit.
Another is since I lowered my original expectations and and thoughts on the engine, 5k max
rpm will be just fine.
Unless I can breed the street dominator I have left over from a Ford 302 I did years ago;)