340 vibration

lets see... 72 340..original motor to the car. converted to manual trans many ys ago.30 over. balanced and blueprinted 12 to 1 slugs. ported x heads , 4 sp 391s. using the same flywheel it had when motor was built.. as is the balancer. has 68 cast iron bell.new centerforce clutch. motor mounts new, trans rebuilt.comp cams 491 lift cam(forgot #) new pilot bushing.runs 10 in vacuum . 770 holley street avenger on ld340 manifold. accel dist, Mallory ign box . new blue streak wires. firing order is correct?have not replaced trans mount, but it looks ok...