273 solid Crower cam opinions

Smoother idle than what?
That's a pretty big cam for a 273.(59* overlap,67*ICA@108installed centerline) Lots of rumpity-rump.She'll burn some gas allright.
If you're gonna run logs, you might consider a split pattern cam with maybe 10 * more exhaust duration at 050, than what's on the intake.
And if you have a stick car, I would tighten up the LDA to 110/108
I would run as much lift as the heads will allow, and without getting into the pistons.
Ima thinking custom cam, as previously mentioned. If you go that route, be sure to know your exact combustion chamber volume.