Smellinrubber, I love your Challenger. You did many of the same things I want to do to mine. Mine will be a 71 T/A clone with painted fiberglass bumpers and aluminum front spoiler as well. Are you running Nitto NT01s?
An easy way I found to resize pics in Vista is to:
right click the image,
select open with,
choose windows paint,
choose resize,
in height and width boxes type 30%,
Save as "_____",
Then upload your new resized image.
Probably better to do it with imageshack or whatever, but that's how I do mine.