Carnera was a circus strongman . He achieved a one hand snatch of 220lbs. I'm sure if he had a arm wrestle with AJ he would crush him.
I know one thing, with today's advances we would be calling Carnera a "SHW with skill". Being in Carnera shape years ago took away the athleticism where as now that is no longer the case. It's like 300lb wrestlers can leap 10ft off the top rope now.
I guess it depends on what junction of Carnera's career he was in. I've seen some photos where he looked fairly cut and muscular and others where he was a little loose around the waste. Very strong man Carnera was.
Hmm...Carnera was a brick house built on old school training and grit whereas Joshua has been pumped up and inflated on steroids for years so....I am gonna have to go with Carnera hands down.