Be sure to check the clearance at the push rod guide hole in the cylinder head. 1.6 rockers will put the p-rod very close to- if not touching it.
You can easily make an adjustable push rod length checker
from an old push rod.
• Rocker arms
has info on ratios and using a Lewis tool to open the push rod guide holes in the head.
• Valve spring installed height
• Points to check
• Adjust lifters
• Cam break in