I have to jump in on this too. I have had great results from Summit on many parts orders. When it came time to buy the Ramjet 350 for my 77 Cheyenne, I shopped the net for weeks trying to find the best deal. I called the top three suppliers, and none of them had it in stock. It would be dropped shipped from GM in 4 to 6 weeks.
I called Summit and asked them if they had it in stock, and they did. I gave them a link to my best deal which they matched. The icing on the cake was they were offering free shipping at that time. They squealed a bit about free shipping and price match, but they honored it.
I had the motor in my builders shop that week....
