***Hydraulic cam recommend for my 273....

This is what I have been running for 20 years or so:
Crower 31914
Adv. duration: 264/264
Duration at .050: 208/208
Lift: .427/.427
Lobe center: 110

Not really a thumper but it still revs quickly like a Commando should.

Still using the adjustable rockers and stock valve springs.