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H440 is a 1972 440 engine.

The last six don't tell you much, other than the unique vehicle number. The first six will give you general info about the car, ex lm23p9b is a dart, swinger, hardtop, 340, 1969, hamtramck built. So to get anymore info about what the engine came out of, you need the rest of the numbers.

so the last six of the vin makes sense... 146673. that leaves 2 which should be the year of the vehicle that it was pulled from, 1972. the 0 might be a G, which would be St. Louis plant. Or maybe a B which would be the Hamtramck plant.

21046673 looks incorrect. last six digits should be the last of the vin, but should not start with 0. if it is a late built vehicle, judging from the cast date 4-28-71 it could be that last number did not show...46673X? that would leave 210. 2 should be a letter like L meaning 440, 1 would...

440 is wider/taller than a 383, since it is a Raised block, or RB. The 383 is a B block. It will bolt to everything the 44o does, except perhaps the motor mounts.

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Funny, as I've cut apart plenty of Mopar sheetmetal over the years, that almost everything is spot welded. Lots of overlapping in the rocker panel area, strength built in with bends and curves. There is some stitch welded area on the floor hump as I remember... my 2 pennies