Probably wouldn't be a problem....if it were a race engine, but it's just a wheezy little 305 with a long stroke and a peanut sized bore.... A stock 305 doesn't need near that much duration or lift.... Might want to check Comp Cams and download their Cam Quest program (it's free) then punch in the real information on your engine and see what they suggest....

A too big cam won't hurt cam bearings, if the valve springs haven't been in coil bind, or the valves haven't hit the pistons, a simple cam change would be in order. Guessing what the bearings look like would be just a guess...when you're changing cam and lifters, check the pushrods for straightness and all the other parts in the valve train for excessive wear...

If you want your new cam to last, make it a roller cam. Today's oil just isn't up to the task of lubricating flat tappet cams in a manner that will promote a long life!!!!!