the OEM springs are plenty, for everyday use.
My engine builder shimmed the new OEM springs for my ported/polished heads to provide 5 lbs more open and 10 lbs more closed pressures. This was because the heads would flow to a higher rpm than stock. OEM is 75lbs open and 30 lbs closed which he said was fine for the flow rpm of stock heads.
any more lbs and camshaft life will be reduced.
this place sells beehive springs for high end racing, open pressure is 115lbs. camshafts will be short lived.
https://www.rdvalvespring.com/spring-kits
