you can email proline at
info@prolineboats.com 
they should be able to answer your ?

it shouldnt be too far from the new ones.

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i was told the draft as listed for my trophy in 1994 is only an inch different than the new ones.

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your motor lbs plays a good part, than you have a battery(s), fuel & what ever.

with my 88 j140, i put an additional 60+ lbs back there.