External differences between 4 and 5 horse briggs?

#1
I know there's a similar thread about 4hp vs 5hp motors, but I have a different question and didn't want to hijack his. I'm restoring a bike that originally came with a 4 horse, and I have a good running 5 horse sitting in the garage. How do these motors differ in appearance? Anything really obvious? If I paint it white like the original and slap some 4hp decals on it, will it fool most people? Not trying to build a show bike or scam someone with false advertisement, I'm building it for myself but would like to make it look like it did 40 years ago!
 
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