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10066036 =...350......1984 & up.....2 or 4 Bolt Mains (need to look)...
Target Master/Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico" (Made in Mexico) sold in GM Parts
While most of these engines were built for replacing stock motors & sold thru Parts, this is "not" the engine I would spend money on, for performance.
Try to find a Block / Engine in the late 60's to early 70's with 4 bolt mains