That was my dilema when I modified my engine. I wanted to get some aluminum heads, but didn't have the cash at the time so I ported my stockers and shaved them at work .030". Then I took them to a shop and had a 3 angle valve job done and pressure tested. Shop labor cost me $100 and the springs cost me $100 I think. So for around $200 I can't complain at all.
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