[Mr70]

Keith
What issue in 1988?
I have them all here & can not find what issue you reference.
That is a Very interesting letter.Who is Ray?
That line about the exhaust manifold date is odd.I would think naturally the exhaust manifolds would pre date the engine assembly date.
The MC suffix is 427/390HP 1969 Chevrolet SS 427 w/HD clutch.

I have a Tonawanda Production book from Fran Preve,and it states for 1969:
277 MQ Manual Trans.427 engines assembled.
96 MP TH400 427 engines assembled.
---
373 Total engines assembled.
323 Total COPO Chevelles built,including 99 Yenkos.
= 50 service engines left over.