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There is a piston the size you want or close at least its the SRP 1.48" forged dead flat top not a left over 383 23 degree chevy job like the kbs you speak of.
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Yup, they're good slugs too, only suit 5.7" rod so A9L's are out.
The only thing to watch is comp if running dead flat top slugs in a 355 with early heads & zero deck - it's usually pretty high, gotta be carefull.
I don't generally hang the slugs out the deck for street engines - little gain & if you need to mill the decks in the future the slugs will have to be machined & everything rebalanced. If you run zero deck you've got a light skim or 2 left in the block before you have to worry about machining anything else.
For comp engines I've run them up to .012" out the deck on a .045" gasket - so .33" piston/head clearance - but that's pushing it a bit.