516 head question

true thats a handy tool. I am getting a shop to build the heads. I just wanted to gather up as much as I could and use something more severe duty wise than sbi replacement suff. I hope I'm making the right choice because its been a merry go round to get this done. I dont know how I pulled it off back 35 years ago in a hay barn
Yeah I get it however the hydraulic flat tappet isn't going to withstand much more spring pressure than recommended without edm lifters or a perfect break in. I run edm lifters on a solid flat tappet, have a 2.19 intake valve so I run a bit more spring pressure on my intake.