here is a good site to get parts from. they have about everything you need. i would lightly ball hone the cylinders and either buy new rings or cleanthe old ones in laquer thinner and clean behind them which you will have to do anyway and put it back together with the old cleanedones. just put the ringsbackon the piston they came from. i did that to a 225 and the compression before was 65 to 70 on most and 25 to 30 others. cleaned and got the carbon outof the ring grooves in the pistons lightly hones with a (ball home required) and put back together checked compression had 90 to 92 on all 6 cylinders. i was right on the books factory specs.
http://www.powerheadkit.com/Looper%20V4%20parts.htm
You will need Gel Seal to seal the crank case back together or can buy 1211 Crank case bond. 1211 is stronger usually used in high hp high compression jet ski race motors but works great on outboards. in place of J/E assembly lub just use Marvil Mystery Oil as assembly lub. will burn away after motor warms up and is great break in oil.
Here's the 1211 Bond avail on ebay.
http://cgi.ebay.com/ebaymotors/1211-...spagenameZWD1V
Gel Seal is avail on the link for parts above. Gel Seal has a shelf life. 1211 Bond doesn't