Just remember that the 59 degree blocks are not very roller cam friendly beacuse of the pushrod angle's... too much monkey motion. Offset valves/and rockers help quite a bit.
Not all roller lifters will work but there is some that work just fine. I have about 2000-2500 miles on a solid roller W2 headed 59* R1 block. I am using some mopar performance/crane roller lifters that clear the R1, comp also makes a lifter with the link bar moved that would work with the 59* R blocks. I think the comp lifter is an 8043-16 but not positive.
Going with a G3 would not be a bad idea though.
