Leaf spring help !

[Jims69z28]

Need help trying to figure out what rear springs to put in 68 camaro convertible ?
My car was originally a 2 speed powerglide 327 with mono leaf 10 bolt . I've got a built 350 small block with 400 hp, tremec tkx with .68 5th gear and 12 bolt posi with 355 gears that's ready to install after paint . I was thinking the assembly line correct 5 leaf rear spring that heartbeat city sells would be a good choice ! Has anyone used these springs on a 68 or 69 camaro convertible ? Thanks in advance for any recommendations. Jim