Believe it or not, guys, I have seen this procedure done, out & in, in one day. Back in college, the mechanic at the station, pulled out the crankshaft with flex plate, had it turned at the local shop, and car was running at 4 PM. This was a full size 68 Chev Impala.
He started at 8 AM., unbolted the t/conv, shoved it back, blocked up the front of engine, I think he used a 4X4 plus a 2X4 per side (for the height, car was on a drive-on hoist), unbolted the rod caps and shoved all of the rods up to TDC, removed the h/bal & timing chain, removed the main caps, tongue in left corner of lips, crank was out. Installation was reverse.
Machine shop turned it, fit a set brgs, and crank installed that PM. Like I said, running at 4 PM.
I was amazed. But, yes, as with others here, I'd check the small (easy) stuff first. If no metal in pan and/or filter, it could be piston slap. But this most definite at cold start-up. If you were to disconnect a cylinder at one time, does the knock go away? Is oil pressure good? Fifteen lbs @ idle and 40 lbs at 2500 rpm? Rocker arm clatter?
Keep us posted.......
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CUBS - 2016 World Series Champions - maybe this year, 2019 ...