crane s/b hyd cam and lifters

moparraceman said

for sale s/b crane hyd h-278-2 cam and lifters used but good condition 318-340-360-273 has 494 lift and 234 dur @50 $60. plus shipping

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I am wanting to put a cam in my 318. my mechanic told me to get a crane cam that had a 488 lift and 288 duration. how close is this cam to the one he told me to get? are the numbers that far off to make a signifigant difference or what? thank you very much.