Are file fit rings a must with higher compression?

[87tpita]

I just got a 385ci shortblock with 6k miles on it to replace my 350. Its going to end up being 10.4:1 with my heads. Im assuming the sn92 will push 2-4 psi with this setup. the rotating assembly has to be pulled out and it has file fit rings for N20 right now. I was thinking of putting in new moly rings when I put it back together, would I be safe to install them without file fitting due to the psi or can I reuse the original rings? I dont want to file fit new rings myself (read its very easy to screw up) and dont want to pay a machine shop unless its absolutely necessary. In your opinion what should I do?

[speedytang]

I never use file fit rings and never a problem with blow-by or rings collapsing against themselves.