511 Indy with Veney Heads cam Timing

Working on a Hemi With 2.5 veney heads. Can't seem to get the cam Timed for Optimal piston to valve Clearance. I have tried setting it between 30° and 38° at .050 lift. At 30° I can get .062 intake clearance at 8° ATDC. I currently have it set now to 32° and have .035 intake clearance. The Centerline on the cam card is 110 and at that 32° I'm sitting at 108° centerline. How low can I go on the Timing and still be OK power wise? I have test springs in it now, how many thousandths will I gain when putting the actual springs back in? They are 433# springs. I attached the cam specs that Comp Cams sent.