which heads on a 318

Depends on your ability.
Like I said, I can get the numbers through a stock size valve.

But if 6000+rpm shifts are your thing, maybe the added area of 1.88 intake valves would be better for you.

I am thinking you'll be good with the stock sizes, if you can do the port work.

My numbers are without doing a performance Valve job, just the tired factory angles, the performance valve jog would increase the numbers to my knowledge.

Btw eddies or 'swirllys' can send backwash pulses that cause/create a road block, it's the dead/slow air as opposed to the fast moving air found when the air passes around obsticals and crashes into it's self like dead pools in rivers and where the drift wood jsut spins around in the same spot, stuck there, the crashing may or may not create fuel drop out, the dead spots however do not promote suspension thats for sure.
Other porters I have talked to mention eddies in the sense of pulses so to speak that send back flow which makes a road block, they ,from what Im told can come about from the the air after passing the valve hits the parting line of the head/gasket/block deck and falls to crap with the air blasting off everywhere and creating another road block for the rest of the moving air behind it, it's just air crashing into air.
None the less....it's not good.