Some of the stroker cranks for the 340 were 8 bolt cranks. I have one. I sold my 8 bolt flywheel when I went automatic. The ones for the hemi fit. Ram clutches makes a 130 tooth 8 bolt and a 143 tooth 8 bolt. They are billet steel and weight 30 Lbs. I think hays also make the same ones. I think both of these can also be had in aluminum. You can get these from Jegs.