87 302 Flat tapped cam to roller cam

I have a 1987 302 from a f-150 and wanted to know how hard it would be to change the cam, rocker arms, springs, and rod to a roller cam set up. Also what all would I have to do.

I used a 86 E-150 302 block in my 87 grand marquis and had the shop that did the machine work spot face, drill and tap the the spider casting bumps for the spider. I just used the roller pieces from the old block. Spider and hold down bolts, tie bars, cam, lifters, push rods and you need the steel distributor gear to go with the cam.