small problem with the holley 350 on my slant 6

OK, so you threw a few pushrods? Take them out and roll them on a flat surface and see if they are bent. Replace as necessary. Now you got mechanical rockers on there, they need to be adjusted, they are not hydraulic lifters (unless its a late model, slim chance) A few dead cylinders would cause an otherwise sewing machine smooth slant to shake a tad....Then check timing, TDC with a piston stop or a drum stick in #1 spark plug hole and you turning the motor by hand until the stick just moves, mark balancer then turn the other way and mark that point of contact. right between those marks is TDC