Tighten them all the way without a feeler gauge. You should be able to tell when the valve starts opening with the intake on. Then back off until the gauge will slip in tand tighten. I really don't think that having the intake off will help you much other than seeing when the lifter is on the base circle, which is not that hard to figure out with the intake on. You will need to tighten them slowly to allow any oil inside to leak down. The shop likely screwed it up, but you should be able to get it right pretty easily unless they had them tightened way down so a piston hit a valve and bent it. Might not hurt to pull the plugs and do a compression check and check all the pushrods for straightness. I have had 'professional' mechanics do serious damage when working on non-standard aftermarket equipment.
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