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you just have to weigh your options vs how much you want to spend. Keep in mind that what you mentioned won't work, as the L92 heads require a 4.00" bore, so you are stuck moving to at least a 6.0 block.
you also have to determine how much power you want to put out. If you are only looking for 450-500HP, the stock bottom end is perfectly fine, you might consider getting a set of 243 heads and a camshaft, and you are there (in reality, this ls series can handle more power than that, but people like the secruity blanket of heavier duty parts). It will be defintely cheaper, since you probably only need minor machinist cleanup on everything, vs buying a new stroker crank and etc etc. You'd probably get new pistons (if you need a bore.), but otherwise, it's just soft parts (seals, rings, bearings), so it will be cheaper component wise, might be pricier if you don't do the work yourself, but it still will work out cheaper than a crate.
if you are looking for stupid levels of power, a pre assembled crate is a good idea, since you probably would be replacing everything anyway.
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