Re: 5.3 swap
I am fitting a LS motor right now in my 65. It had the Trailblazer pan and I had to switch to the Silverado pan. I was able to put the crank centerline at the same height as the original 283 I took out. The bottom of the pan sits well below the cross member. It looks like a shorter pan with a longer sump might work as well.
TR
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