A 1974 would not have come with a 350. Period. They used the Buick 350 back in the day, but not in 74.
The Turbo400 was the auto tranny used back then. The early ones like mine were a "nailhead" pattern, which used an adapter ring to get a generic transmission bolt pattern to bolt up to numerous engines. In 94 they switched to using an actual AMC pattern bellhousing on the transmission case.
That 350 isnt stock.
The sad thing, according the the 8th digit in that vin, is your truck originally came with a 401. Now it has a 350 that somebody dropped in there.
Yeah, I saw the 400ci number. What a shame. The next mystery is that the previous owner "says" it's a 383. Now the drop of the oil pan is next to try and determine that fact. I suppose. But lucky day on the '74.
a 383 is a stroker 350 ie a 400 Chevy stroke in an .030 over 350 block. Good engine when done correctly. As jetsetter said above you will need to drop the pan and measure the stroke or look for where the block was clearanced along the pan rail to clear the crank throws.
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