The CRT in the engine stamp indicates an LS5 454, manual trans. Look a little closer at that stamp. Tonawanda plant stamped the engine with a T followed by 4 digits, followed by the suffix, CRT in this case. Also look to the right of that number and see if you see the assembly plant stamping, Kansas City assembly plant in this case, the K in the VIN. That stamping should have the partial VIN number of the car. It may be upside down from the other stamping, seems Kansas City plant did that.
The 3885010 looks to be a 66-67 Muncie main case casting number. 3978764 is a the tail housing casting number, 70-74 Chevelle. Hard to say what the trans is for sure other than a Muncie 4 spd.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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