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EVERYTHING, Bolts right up.. it's the same block. They are so close I bet the ecm will not even notice.
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if you can do it with the budget you have i say go for it.do the prom change or throw a hypertec chip in it https://www.summitracing.com/parts/...BPdeI0EJxw-rZTi2DL8HEfY7efRLVoMQaAmotEALw_wcB
it's not a hp thing it's torque.....the 305 is one of the worst small blocks kinda like a 307 IMO and my truck has a 305. 305's just don't breathe.i have had them in 5 different cars.that being said my truck has 209k on it curps second (corvette servo) and don't leak a drop or burn oil.i want to pull it but i have a hard time pulling a "good motor",when it screws up i'll go 350 or i have a 5.3 siting on my engine stand.
actually you could throw a chip in the 305 and you may be happy.