ok , my friend has a 69 camaro with 12 bolt posi 4.11, 3500 stall, turbo 350 trans , me and him built a 355 sbc ...balanced with doug herbert 630 lift solid roller 106 lobe seperation, chevy cast crank, vortec powdered metal rods(pm) old school forged heavy pistons ,dart pro 1 heads ..2.05...