I recently acquired a set of Edelbrock Performer heads #60379 (no springs/valves included 1.90 in /1.60 ex) for my '92 5.0. This is my first go at a 5.0

I'm going with:
GT 40 upper/lower 1"spacer
Speed density with a '95 slot MAS
SCT Eliminator chip and custom tune (to come)
Professional Products fuel rail kit and reg
BBK 65mm TB and EGR spacer
24# injectors
TFS Stage 1 cam
Crane Energizer 1.7 RR
Comp cams 6.25" x 5/16" push rods

The Edelbrock website is confusing. Tech keeps you on hold forever!

What spring kit is recommended? (I want a complete kit.)
What timing chain should I use?

... and what degree timing with AOTA (I have 11* now)

There's a lot of good stuff out there, and a lot of junk as well.

I've heard that beehives are good, doubles are better, some have crappy seats, locks or retainers, etc.

Thanks!