Do a search for Comp Cams #1414-12 find the best prices.
http://www.summitracing.com/parts/CCA-1414-12/
Geoff Moore (betterthenyou) did a good write up on installing the valve covers.
http://members.shaw.ca/betterthanyoutoo ... covers.htm I used FelPro Gaskets
I buy parts from Ebay, Rockauto, and Autozone depending on the price and how fast I want them. Hardly ever buy parts from the stealership.
If you are going to do a water pump you might as well do a timing chain and dampner.
GM Part Numbers 12363215 â€" Valve Spring
This valve spring is used in the new 3.4-liter engine conversion package
(P/N 12363230) and designed for moderate performance usage.
Manufactured from chrome silicon wire, this spring produces 105 pounds of
seat pressure at an installed height of 1.70" and 296 pounds open pressure
at a height of 1.20".
Technical Note: Use with retainer P/N 12363216 "
These are the springs I ended up using--
1.25" OD early Z28 Lt1 springs. Both Crane and Comp Cams use these springs with there 60* v-6 cam kits. The last two sets of springs I got off Ebay with locks and retainers for $40 each.
All this depends on a good compression test, no use throwing money into a block with warn out rings.
I have 265K miles on the engine now. I put a new timing chain and valve springs and seals on when High oil consumption started at about 140K miles.
Hope this helps