Secondly, I was under the impression that all shims were the same size.
And just to be clear the shim is the tiny little bucket (not the big one that covers the spiring) that goes on the end of the valve and it needs to be replaced with one of those circle things from IAP? Right? I just wanna make sure im doing this right.
1. No, the thickness of the shims are not all the same. They vary so you can adjust the valve clearance.
2. Yes, the shim is the small bucket in the centre, not the large bucket. Yes, you will need to purchase the right thickness shim. That circle thing you see when you open the IAP is not the right shim for your year. Its just a picture. When you use the drop down menu for the size, they will send you the small shim bucket.
Its good that the head is on the bench. This eliminates possibility of bent valves.
You will need to measure the current valve clearance, which I believe you have done using feeler guages.
You will need to measure the thickness of the shims as well using a micrometer.
I used this chart to tell me what the size of the required shim I need to use.
I have set it to your year, clearance.
To use the chart, you enter the current clearance and the current shim thickness and it will spit out what size you need to use.
I put in examples to show you how it works. For the intake the current clearance is too large and the exhaust is too tight.
Hope it helps.