Roller Rockers 1.5 vs 1.6

Duration is what causes valve to piston contact not lift. Max lift is not a concern. Guys listen to @PRH here. And @DentalDart you measure for P to V at split overlap around 10-15 degrees + or - not at TDC compression.
Partly so. Both can cause interference issues, which must be checked every time components of the valvetrain or piton are changed. A high lift rocker may benefit from retarding the cam 2° to 3°. This would increase valve to piston clearance, but the only way to know what the engine wants is to test on a dyno. On a solid lifter combination, tightening or loosening valve lash by 0.002" may be required.
Watch the videos as he has a lot of useful information. Granted most seems to apply to Ford or Chevy engines, the one thing you need to remember is that ports, valves and pistons do not know or respond to what name is on the hood. They respond to airflow and compression ratio. The general rules apply to all, like short turn radius. Once you introduce power adders, some of that changes. Larger, better flowing exhaust becomes important. Turbos respond to low restriction exhaust, from the valve out.