The early 54 was the last 235 that was designed for use with shims. The engines after that did not use shims. If you have any bearings that are not within spec, contact the machinist.
Plastigage is not that great for checking clearances. Too many variables that can mess up the readings. The correct method uses micrometers and snap gauges. It's okay for a street engine, but if you're building a performance engine the mechanical measuring tools should be used.
