At 83mm it has already been resleeved. CP pistons makes an 83mm off the shelf piston I believe but I'd just take it out to 84 or 84.5mm. LS cranks are not too expensive and you can use the oil pan and pickup off of your b16a motor along with the rear seal plate. Sounds like a nice block but why is the seller selling? Sleeved blocks have their own set of unique problems and make sure you aren't buying someones elses headache.