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Help me remember the diff between 384 30-31 and 35 heads

8/17/18
-Gasket 171952 called out for 1930 thru 1936
-Parts Book photo of 740 engine shows port for Temp Bulb

Assume a 4 bolt dist base can be manufacture so '35 DELCO Dist can be used. AGREE ?

Is coolant outlet inline with radiator inlet ?

1. The early head has a formed water outlet, whereas the late heads have the water outlet that bolts on.
2. The early head has the 4 bolt base for the O/D distributor, whereas the late head has the 3 bolt base for the Delco unit.
3. I may be wrong on this, but don't the early heads have the larger spark plugs?
4. Not sure, but no temp gauge port on early head??
other minor accessory details??

Owen Dyneto distributors used a 3-bolt base in 1933/34.