Timing chain question

hi I'm building a mile 360 Street motor something less than 400 horses or maybe 400 when it comes to the timing chain I'm looking at double roller timing chain how important is it do you have more than one keyway thank you guys

It's handy for adjusting timing, but its also important as soaking the timing chain in some warm Redline synthetic gear lube on it's side for a day and to add the timing chain tensioner to the motor.

The gear lube trick has essentially eliminated measurable chain stretch on several of my motors. I discovered it using my chain saw, where it has quadrupled times 2 the chain life over conventional lube.