lifters, and cam profile questions

[89s13silvia]

ok so when assembling my motor after my build I found out that the previous owner(from japan) has taken apart the exhaust side lifters and shimmed them to make them solid. Now i have run them for a while and they are really loud. I was looking to replace them with hla's but for 4 i could buy a complete set of solids. I am just wondering what input u have for me as to whether buying the shim setup and shimming all 8 of them to the correct .004". Or just going out and picking up a set of lash killer solids as they are quite a lot more. Or the tomeis which i believe are about 250?

As of right now i have hks 256 cams step 1 and a gt2871r .64 A/R turbo. I was thinking of upgrading to the larger 264 or 272 Brian Crower cams as the same time. I'm wondering if any of you have these set ups on the .64 A/R and how it is? 272 overkill?

also my top and bottom end are both built with bc springs and retainers and ras.

anyway all imput is appreciated
thanks
chris