If you really truly want roller lifters then I believ you are stuck custom making them. At that rate its a crap shoot if you dont totally understand whats going on and they may break causing even more money to be spent...But thats the nature of the beast, if you want one off custom stuff, thats the chance you take to pave your road to innovation. Personally if it were me, I would leave solid lifters in it and go...solids are good up to about 8000-8400 if you have the right valve springs and camshaft to make it all work. Least wise that is what I have saw and done in the SBC/BBC world...there is nothing wrong with running solid lifter setup. I think I would worry about my chassis and getting weight placement right as well as making it hook with minimal wheel "spin" before I worried about the minimal gain in roller rockers....As my dad always tells me, "somethings are worth the money right off the bat some arent. Its up to you to decide wether or not something is $400 faster."