I see my 435 has a large retainer with a smaller 4xx" bolt pattern and my 833od has the large retainer 5+" bolt pattern so they do not swap for sure.

so far about the same price on the Lakewood cast alum bell for SB & BB 833/833od/tremac 5 speed are 400$ -/+ and a mopar A or B-body SB 833 bell goes about 400$

thinking I will go for the bell I found for a 72-body SB 833 bell about 200$ and have the retainer hole opened up for the 833od retainer or just get a rebuilt B-body 833 trans to fit the 72 bell with out modifrying it.