How did you learn,to tame big cams on the street?....

I wouldn't consider a 238/248 to be a particularly big cam for a 396.
with the right tuning I'd 100% expect it to be decent around town.

I'm in the process of swapping a 254/254 on 108 solid into my 318 for a drag meet in december.

I expect it will be on the ragged edge of streetable, but it cost me nearly nothing and it's temporary.