i have a 85 200x that i just put a fresh top end on,its been bored with a wisco 10:5 to 1 piston.I just got it running today and it misses in low end pretty bad when you rev it up it runs good.Could i have the timing off?do i need to jet it?it still has stock jet in it.Any help would be greatly appreciated. im new to the post so tell me if i screwed nything up at all thanks, Jordan