Here is all the info on my #s matching motor and I have the dealer invoice that is dated 4-29-69 so I think that puts the car at Ground Zero for the actual date of being built on approximately 4-26
WM23M9A263554 Order # 924487 4/26
Motor cast 2/19/69 assembled 3/19/69, HP only No HP2
Carbs front- 101 day 69, April 11 center-93 day 69, April 3 rear-93 day 69, April 3
Distributor 7th week 69, late Feb 69
My guess of the engine assembly date is for only the reciprocating assembly, I believe carb and manifold were added after engine assembly date, most probably due to Edelbrocks slow delivery of the manifolds
Dave
69.5 A12 Bee, first purchased in 1976, car 169 on registry
69 Coronet R/T 440/4 spd
69 Coronet 500 Conv H code 383 4bbl/auto
37 Plymouth PU
Find your spot on earth and ride it.
