In building the parts list for my 351 in my '69 Cougar, I've had to look to sources outside Summit, but then again, the build I'm basing mine off of is a $14,000 build. I'm trying to land somewhere less than that in $$$ and power. Summit is a great company, though. It just seems that the support for 350s is so much greater than the 351 and parts are often cheaper.