it will be right for the moment, and should handle a small shot of NOS (50hp or so) but when you turbo it you will need to rebuild the engine, using forged low compression pistons, and getting the stock rods checked for straightness or getting stronger ones, same with the crank, must be crack tested and new bearings etc all round.
it depends on how hard you want to go - stock rods and crank should be good for a fair amount of boost (15psi?) IMHO, i have heard many flattering things about the durability of the 250 bottom end, but im not sure exactly what its safe limits are.
i also strongly reccomend you think about running it on straight LPG, it will be much more efficient then a carby turbo setup, and cost a lot less than getting an aftermarket fuel injection setup fitted and tuned, you wont need as big an intercooler as the gas cools the air as it mixes, it has a much higher octane rating than petrol and its way cheaper - you use a little more gas than you would petrol, but its still cheaper.
straight LPG is the way to go with forced induction setups i reckon!
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