Economical replacement rocker arm set?

BTW, this my not be possible with the intake on..... Look into the lifter bore for #3 ex and several others and see if the holes in the sides of the lifter bores are all about the same in each one. My son's 340 block had 1-2 unusually small side holes near the center of the passenger side lifter gallery, where the drilling of the interior of the lifter gallery was not done completely through at the factory. We had to assure ourselves that the lifters' waist bands would reach those unusually small side holes at some point in the lifter movement to get oil into the lifter.

That's just a reeeeeally long shot...so I would not pull the intake for just that.