You asked for opinions. Here is mine.
If its gonna just be a street car, leave it alone. As others have suggested, play with the carb a little more.
If, however, you want it to run perform much better, the convertor and carb would be two places to attack the ET that would really wake it up. Not in love with the M1 either, if you are gonna keep it on the street it likely would run better with an airgap, as far as seat of the pants
You have a relatively “ big “ intake on it, “big “ headers on it, but a convertor that doesn't match.
I would bet that a good 4800-5000 flash 8 inch convertor and a 950-1000 cfm race 4150 carb would really wake it up. Cam seems a decent choice, i run the next one up Howards sells( 260/264) in my 360 but its soon going in a 418 where it belongs. Good choice you have made, imo.
Its never going to run where it could until you get it to 60 foot. It should be 1.50 ish. The carb and convertor would, i bet, get it there.
I would also throw the snubber in the garbage can.
Your combo has excellent potential. Could run in the 10’s very easily with modest changes.
Get it to come out of the gate, other incrementals will come around and it will pick up rpm on the big end. Gear and tire are fine. Convertor, carb, convertor, carb
