I'm considering the RHS vortec pro torkers, they are relatively cheap and can accept any style manifold which is a plus. You can only buy them bare from summit and I had a few questions about putting a set together. 1. They have 1.550" valve spring seats, can I use a spring smaller than that? As I have some new springs.
2. Valves, I'm not good with picking out valves due to different lengths and what not. What lengths do I need to retain stock function?

Basically I'm looking for a good parts list to assemble these heads and have them coast under the $1000.00 assembled price that RHS wants.