well i said what buttons i used if you need to cut them down then a solid button are ez to work with all you need is a hack saw and file if you have no lathe .the button fits in the top gear and a lock plate holds it in.some times you may have to machine top gear or bottom so the chain is running straight.this from time to time i have to fix this.if iron core roller cam stock pump rod and dist gear will work. push rods are not the same you need to buy push rods for make of lifters. erson cam lifters are not going to use the same as comp cam . yes you can use a set of used roller lifters .yes you can use steel stamp rockers if they are long slots. less cam is a small cam. you can and i have used solid roller s on the street they are abit loud but your not going to have to lash them all the time less some thing wearing out. i put roller cams in BBC only you can do what ever you want .if you go on line most of this or call them and they will tell you all you need to know .as well on here are many post on here that i posted on