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Assuming you can machine your crank, block and heads. you can get a stock rebuild kit for about $500, machine work will run about $500, and misc items(new fuel pump, intake?/carb? will all run about $800. $1800 would be about right for a stock rebuild unless you have some buddies in the machine shop. It cost me $3000 but I went high performance on some items and converted from a 360 to a 390.
It really depends on what condition it is in and what you want to do. The heads are where you can get to spending some real money if they are worn. If you need all new valve guides and valves then it can get rediculous.
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