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Ford came out with the first V8 in 1932 and it evolved as a flathead (L head)
engine through 1953 in Ford and Mercury automobiles and very similar V8, V12
and V16 engines in the miscellaneous Lincoln and Lincoln Zephyr cars.
To the best of my knowledge the aluminum heads were used from about 1934-37,
and were then abandoned because the heads were held down by studs so once you
got the nuts off the heads were still stuck.

When you put the bellhousing back on, be sure and put a little grease on the
pinholes and also on the bolt shanks. May save you some grief.

Do you see any white corrosion product around the pins?

If you heat, remember that aluminum conducts a lot of heat very fast and
so you need to be careful how you do it. Maybe a little bernzomatic work
right at the pin would be best. In case of hydrated corrosion products,
you might be able to dehydrate them at maybe 250°F or less and greatly reduce
their volume. Under no circumstances do you want to heat enough to make the
pin turn blue.
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George Downs Bartlesville, Heart of the USA!