OK, I found the block casting numbers D2AE-CA. According to some web pages, it is described as:
"Four bolt main bearing caps. Originally equipped with split lip rear main bearing seal. Special block cast with thicker cylinder walls and siamesed bores for racing use carries an XE192540 casting number."
Any good?
I still can't locate the head casting numbers. The intake is off but I still don't see them. Maybe if I poke around with my white tipped cane a bit more . . .
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