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Pretty sure a 1990 would have been a roller cam engine originally.
I'm not a small block guy but I think the lifter bores/ casting are taller than the older la engines to support the roller lifters.
Hopefully someone more knowledgeable than me on small blocks can chime in.
One giveaway is that an original VIN stamping pad has curved flycutter machining marks like the original one above. The one on FB does not have these markings