Mark, I swapped in a 2002 5.3L and 4l60E into a 65 for a customer. Kept his 3.73 gear and with OD and the FI engine it is the prefect driver. app 300 hp stock. If you want more info message me.
I don't know about the crate motors, so no help there.
Jason
1937 GMC T16 468 BBC th350, 4.10
1941 Dodge COE 5.9 cummins, 9 speed roadranger
1947 Diamond T COE, hercules and 4 spd, all original
1955 Chevy LCF 9.0L IH diesel AT545
1962 Corvair (Elsie)
1967 Jeepster Commando
1968 K10
1970 Chevy C50 box truck
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