And if you've ever done this before, which it doesn't sound like the OP has, just go ahead and buy Ls rod bearings for your setup and Golden Eagle oil squirter block offs. You'll be there for a couple of hours bending those things to where the oil squirters don't hit the crank or piston on at least 2 of 4 cylinders. They hit the counterweights on the crank, and the pistons at BDC so its really gay. I say block them off, the plugs are less than $30. Then just try some ACL race Ls rod bearings so they have the lubrication hole and then you will be golden. It's a plus not having to buy an Ls/vtec kit and still being able to use the timing covers.
Secondly I would not use the aftermarket replica b16 pistons if I didn't have to. If there is some slight marring just let a professional see it and they will tell you what you need to know but if not I'd just take it .25mm overbore and use factory pistons. I've used the ones you'll be buying off ebay and they have the "oh so slightest" taper in the skirt from top to bottom. I'm sure the Honda's won't.

Balancing couldn't hurt, usually about $150.