Al, looks like a real nice intake manifold but from tests results that I have read about the M1 as compared to the Edelbrock 440 Single Plane 4150 intake that's shows not much, if any difference in horsepower...and the Trick Flow intake sure looks like a tony twin to the Edelbrock.
I have the Edelbrock 440 Single Plane on my 505" motor but with a Super Sucker 4150 to 4500 adapter and a 1050 Dominator on top of that. The big carb made 3/10s difference over an 850cfm carb but that is with a 505" not a bored 440.
Anyway, you have a very strong running 440. Keep up the good work and be sure and report your et's, etc from your first outing. We all want the info. Thanks, Mike