1The only differance between roller and non roller blocks is the height of the lifter bores. Non roller are a little shorter, because flat tappets are a little shorter.
There are two ways to make the conversion. You can use a 2reduced base circle cam, stock lifters, stock dog bones, and stock spider. You'll need to drill and tap two small shallow holes in the valley to retain the spider. This is probably the cheapest and easiets method. You'll be using stock 3Ford rollers, which are probably the best on the market. And you don't have to remove the heads.
The second is to use a standard cam and link bar lifters. You won't need dog bones, a spider, and you don't need to drill the holes. 4The lifters are aftermarket, and probably not as good; and they cost around $500 a set. Link bar lifters are a lot taller than stock. You'll have to remove the heads to get them in and out. So, if one doesn't seem to be working properly and needs to be inspected, you have to pull the head.
OK... there's some seriously bad info in here that needs to be corrected....
That height difference can cause major issues in the oiling system, especially if the guy bolting things together doesn't know what to look for.
What happens if the lifter comes too high in it's bore????
The reduced base circle cams are pure garbage. They should be avoided like the plague.
Reduced base cams are NOT like a hot chick with STD's... they're like a really ugly chick that you know has STD's and H1N1.
If you go near that, then you deserve what you get...
I won't say the Stock Ford roller lifters are pure garbage... but...
If you have an aftermarket cam, then you may want to think about getting away from the Ford lifters.
As for the link bar lifters being junk.
Do you have any data to back that 'probably' up?
You get what you pay for on this subject.
Just because it comes in a box marked FRPP, doesn't mean it's superior for performance cars...