Like most have said above.
Get a full kit from a vendor, someone who knows these cars.
I would NOT try to piece it together. Too many horror stories.
Comp cams have a bad rap with dirt grease, etc.
Morrel have a bad rap with some of the cross bars not being correctly riveted.
The builder MUST check EVERYTHING, period!
It will be 100% your responsibility that the quality of the product is sufficient for your expectations.
Don’t take this the wrong way, but since you asked what is involved, my advise for roller install is:
By the time you change springs, check lift, remove heads, install and torque ARP bolts/studs. Etc. . . . . . pull the motor, and get some help on the engine stand. While you have it pulled, replace the bearings, and go through it.
If the stock cam is good . . . . . depending on your goal . . . . . I would leave it in and run GOOD OIL, with fresh springs.
Good luck.