Another source for used 6-71 blowers, is old city and over the road buses. That is where I got some of mine in the past. It was a time consuming, very dirty job, but well worth the effort.
I make some 2x2 tops for 4-71 blowers. If anyone is interested in one shoot me a pm or check them out on my website at https://nystromperformance.com/collections/automotive-parts/products/gm-4-71-2x2-top-plate
The Jalopy Journal
