I wouldn't recommend plastigauge although sometimes you gotta do with what you got.
I'd use either (in order of preference)
1.) An inside micrometer (aka "dial bore gauge") in the big end and a outside mic on the crank journals
2.) A snap gauge in the big end and check it with a mic, then mic the journals
3.) A snap gauge in the big end and check it with a dial caliper, then use the dial caliper to check the journals.
Any of those would be better than plastigauge.
The bearing clearance service limit (the max allowed) is .0032"
Optimum is between .0009"-.0017"
The torque spec is 16-19 ft.lbs on all caps, then tighten and additional 90*.
You may as well check the side clearance of the rods with a feeler gauge while you're at it.
Side clearance service limit is .0160"
Optimum is between .0070" - .0130"