Roller cam into a non roller block

[Project_Gotham]

I found a sweet hydraulic roller cam for my EFI 406 but the block is non roller. I have a couple of questions?

1) Has anyone converted their pre 87' block into a roller cam motor? I know you need the retro roller lifters, dual springs and shorter pushrods for the taller lifters. Do I need a cam button to keep the cam from walking since rollers are machined diffrent?

2)I've seen roller lifters(retro fit) go for $380-$500 for a set of 16. Does anyone know where I can find them cheaper? I saw a guy on ebay who sells his blueprints to convert a pre 87' block into a roller lifter block(using the spyder lifter retainer). Not sure if it's a good idea to drill into the lifter valley to save 200 bucks.

3) Is all this even worth it for a roller cam? any opinions?

Please help!
Marcus