Wow. That is a lot of stuff to buy in order to get a GM stock replacement Vortec engine into a 66 C10.
And yes, please read their warranty. Those L31's full warranty applies to those being installed as a stock replacement engine, as in a truck that had an L31 to begin with. Otherwise, they go down to 12 months. So, please be sure before you purchase.
Have you looked at other options for engines?
https://www.summitracing.com/parts/m...ctc1/overview/
Has more HP, has nearly everything you need. Will take a mechanical fuel pump. They come with a 30 mo/50,000 mile warranty if you install or a shop does. And, now they are building them with roller camshafts.
Here is a bunch of different dress options on their roller cam/vortec head 350's.
https://www.summitracing.com/search/...ord=bp3503ctc1