Darin, Sure, I'll throw some ideas around with you. The flames you have decribed are a very safe choice. In fact they are the most popular color combination for flames of the last 40 years. The differences being the "body color" yellow at the front, and the blue tips. The yellow will make the flames look like they fade away at the front.

If you want to be more daring, fade back from orange to a deep hot pink, instead of red

If you use the pinstipe color that was most common, which is a bright blue, it will give the appearance that the tips are blue, because as the stripes come together at the tips, you get a wider area of the blue color before they taper away. I would make the pinstripes at least 1/8th inch wide, or maybe 3/16ths for a bluer looking tip.

If you want to be a little more daring, I would use a purple pinstripe. It is the best complimentary color for yellow, according to art teachers everywhere! If you want to compromise, use a bright violet, which is a blueish-purple.

If you are intending to use the Chrysler "Lemon Twist Yellow" from the early seventies, I would suggest you look at the late model Dodge Viper "Dandelion Yellow". The colors from the '60s and '70s are kind of "muddy" compared to the way paint pigments are made today.