Back to the drawing board... stock low dollar 360

If you put the 770 back on changing the springs will usually slow you down.The jetting /squirters is very close ootb.Remember the gear ratio. Try different brands of spark plugs not all are a direct cross sometimes it makes a difference.Have you checked the plugs for jetting /timing?I think the vs carb will always work better in your situation.How about cam timing That cam comes 5 deg. advanced what about straight up?Alot of what has to be done has to work around your gearing and traction.