When to replace seat foam?

[saxart]

I'm hoping you guys can help...

I'll be recovering the bench seat in my '70 long-bed as soon as the new seat cover shows up from Truckseats. I'm curious what the consensus is as far as when to replace the seat-foam when recovering these seats? For the most part, the foam in my bench seat is slightly yellowed, but doesn't seem to be missing any chunks or damaged in anyway. So, can I use this foam, or should I replace it?

As an aside, this truck is far from a full on resto, but rather more of a shop/patina truck that will only be driven occasionally. The biggest consideration is that I'm a bigger guy (6'2" #245) and really don't want a replacement seat foam that's going to put my head up near the inside roof, and my "chiseled 6-pack" abs against the steering wheel.

Any thoughts you have are greatly appreciated. In the meantime, here is a quick pic of what I'm working with. Obviously I'll have to patch in a small piece where the driver's right elbow would be. I haven't removed the cover from the seat base yet, but I'm guessing the foam isn't damaged since the cover is pretty much intact.