There's a laundry list of issues that cause hard starting but, assuming it [i]is[/i] the choke settings, It's reasonable to surmise that the thermostats (the flat-wound, bi-metal springs under the covers) probably won't behave exactly as they did 60 years ago and how they behave may not match the marks on the covers.
I'd remove the air cleaners, fire it up and watch what they do. Gently touch the high side of each choke plate and see if it likes being a bit richer. I wouldn't depend on the marks entirely and the two may not be the same. A little fiddling to get them matched up is required. Of course, you won't know how you did until the next start-up, but that's what we love about this hobby.....right?
And, if they're not stripped already, be careful not to overtighten the screws in the cast housing.

As my Dad used to say, "you don't just adjust carburetors.......you [i]Play[/i] them."

That's exactly what I do, Frank. It is a pest in AZ., because the night temps can be 40 degrees F lower than late in the afternoon temps. So if I set the chokes at 3pm(15:00), they could be a bit lean the next morning. Anyway, after 60+ years most of us a bit slow it starting up.

Aha! New invention (probably not): A manual adjuster for automatic chokes so we can correct for ambient temps from the cockpit. The equivalent of rotating the covers but without the hassle......I'll get right on it. 😉
F

Last weekend I had a problem where the 2 carbs were behaving differently. By feeling the chambers that contain the spiral spring, I noticed one was getting warm but the other stayed cold. I removed the warm air feed tube from the manifold and found that the cold one was completely blocked. A quick blast of compressed air cleaned it out. Once re-fitted, everything was fine. Hope this helps in case anyone has similar troubles.
Regards,
Brian.

Good tip. Twin H or not, cars that sit for a long time (at certain times of the year, that can be overnight) have that very inviting little hole(s) for insects to build a new home... you know the kind. True that they get baked in time, but the damage has been done.

Changes in ambient temps tends to mitigate the changes in t-stat behavior, i.e., the warmer it is outside, the greater "head-start" it has on beginning to open but it's not exactly Rocket Surgery. If it's perfect today, it won't be tomorrow, but it will be "Sir-viveable".
F

Just setting the carbs on a Twin-H set up may not make them even. It takes a little gadget called, if I remember right, a UniSynch. It's used to balance multiple carburetor setups. I used one on a '53 Twin-H Hornet I had - this was after I had set the carbs to spec. I was quite amazed at how much better the engine ran after using the UniSych.
I got mine from Clifford, as I recall - Hey, this was back in the 1970's - at my age I lucky to be able to remember to go to the bathroom!!!!! 😀

Hudsonly,
Alex Burr
Memphis, TN