looking at buying a 1995 crestliner sportfish 1750 with the 3.0 volvo penta i/o> all i know is that this is some type of gm engine with 135hp! i'm an auto mechanic and looking for any info on this engine? what do i look at before purchase of this boat? are there any mods that can be done to increase power? what would top end be on this boat? is this engine a trust worthy engine? service life of engine? any info would be great! also is 6k to much for a clean boat with auto pilot bow mount, cover?