Will 350 heads that have bean shaved 030 have enough clearance on a 305 with a cam that has459 exh lift 446 int lift and262.0 int duration 2.68 exh duration?

Probably, but you'd still need to make sure the chambers are small enough to yield a decent compression ratio. Most 305's have pistons intended for a 58cc chamber. Anything more would cause poor performance. That cam would run good with 9:1 or higher.