Intake manifold options for a Magnum 5.9/360

I've bought 2 Sets and my son bought a 3rd . I don't know if I will again. The last set definitely cost me an engine.
The first time I bought bare ones about 2008 and stuffed them with reground valves out of cracked original heads. Worked out great.
About 5 years later my son bought a set of "ready to run" heads for an engine that he rebuilt. It ended up an oil burner and 6k later he pulled it apart again and sent those heads thru the machine shop, they did have to do some work on those, don't remember what but it was basic valve job work not porting or such.
Work that I wouldn't expect on a set of brand new heads in service for such a short time. These are on a ramcharger.
Then in 2016 I bought a set of "ready to run out of the box" (they weren't)! That had way too tight stem to guide clearance.
I had exhaust valves hang open and kiss pistons,
When I took those to the machine shop they told me they had to hammer out the valves even many of the intakes. They said that they've had heads off of engines that sat uncovered in a field for 30 years that they didn't have to work so hard to get the valves out of. So I ain't so sure I'm gonna be in much of a hurry to run out and buy another set of EQs...