Welcome aboard
is this a restoration that you plan on doing yourself? or are you planning to pay someone to do a restoration on it? is this a new to you boat or one you have had for a while?
if you do the work yourself, expect to put about $3k into the hull. and since you mentioned interior, plan on putting at least $2k into the interior.
now you have $5k invested in a boat, that I believe came with a mercruiser 470 motor. so in the end, you still have a boat worth about $2000 with a mercruiser 470
if you plan on paying someone to do the restoration, expect to pay between $7 and $10k for the hull and about $4k for the interior.