Floating Pins how to?

I am building a some what of an unusual stroker 318 and have a quick question with some more soon to follow since this is going to be my first engine build and leave it to me to make it a stroker.

Anyways, I have a set of 340 Rods that are bushed. I also have a set of pistons that are for either pressed pins or floating. The O ring gap is present on both ends of the wrist pin openings on the piston.

The pistons came with pressed pins but I want floaters. Is there machining involved to get the pins to float or do I purchase pins made to float?

What do I need to do to get this assembly to be a full floating rod piston assembly?

BTW, the block is a 318 with a Forged Stroker 3.51" to make my bored 0.030 a 341 CU. IN. It will also have Magnum heads and a Air Gap intake with a yet to be determined carb(leaning towards a Rochester Q-Jet). Most of the parts damn near fell into my lap(read cheap) so I don't want ot hear...."Why not just build a 360....?"

I plan on taking pics as soon as I get all the pieces together(bearings, machining, etc) before I assemble. I am hoping some of you guys can walk me thru this. Now just exactly, what is a torque wrench....? J/K