Speaker Upgrade In Older Tube Amp

I have an older (probably 25 years old now) Peavey Encore 65, and it currently has the stock 12" 4ohm Scorpion speaker installed. I think we can all agree that this is a horrible speaker. What I would like to do is install a Celestion Vintage 30 12", however, I believe the resistance of the V30 is 8 (or potentially 16) Ohms.

I am wondering if anyone has any idea of the risks/rewards of installing a speaker into an amplifier like I've mention with a higher resistance than the amp was originally produced with. I have seen references to other attempting the same sort of thing with good sonic results, but I am wondering about what the implications of such an upgrade would be on the electronics.

If anyone has any experience with this sort of project, I would be happy to hear of your experiences.

I've never changed out the speaker in a guitar amp, but I have run complex PA/sound reinforcement systems with varying size amps and speaker ohm-ages. If you want to run the V30 at 4 Ohms, simply add 2 of them. If you only run one it will not be running at the "rated" volume, etc. The amp may or may not be louder.... but it will work. Most speaker I have come across run at 4 and 8 ohms. You are not changing the way the speaker will sound. Basically, it takes less power to run the V30 at it's spec (which may be the same as the Spider @ 8 ohms). Nothing more, nothing less.

Most importantly, it's not going to make your Peavey sound like a Marshall or Vox. The Pre-amp & amp stages have more to do with determining the sound than the speaker does.

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Thanks for your comments. I am not looking to get anything more out of this than a speaker upgrade. I am not looking to have the amp sound like anything more than what it is. I'm just not very happy with the current speaker.