Re: Max valve lift for 350 TBI?
I think you will find that the stock springs will support no more than about 0.470" of lift. Any more than that and you'll be in danger of either valve coil bind or bashing the retainer into the valve stem seal. You can maybe go to half an inch of lift, but you'll need to carefully measure the valve installed height retainer to valve stem clearance, and spring coil bind height.
Besides, if I were you and I was changing a cam, I'd simply pay the extra sixty bucks and put in a new set of springs that are optimized for the cam. Then you'll only have to worry about installed height and retainer/seal clearance.