Just an FYI, but summit has a nice low profile class 3 that sits flush with the frame. Great for daparture angles. You can see it on my '78.
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It's $145 but shipping is free.
http://store.summitracing.com/partd...4294922915+4294839031+400304+115&autoview=sku
.I have a custom class 4 (I think) one that was welded onto my frame before I put on a low profile one. I cut it off so it'll need some angle iron welded back onto it to mount it to the frame, but I can take a few pictures if your interested.
And it's cheap!
I have one off a 82 K30,one off a 90 K2500,and one off a 03 K3500. Take your pick.