Keep in mind that they did offer an XL sized (same as the 4-5hp) with the shorter 3hp brackets.....you dont want to end up with one of those as you'll get the same size tank that you have currently!
next to each other you can really see the difference but on its own it can be kinda hard to tell....The smaller tank the cap/fill is right at the rear corner, the bigger one is in off the back edge about an inch in the era style tank you are looking for at least.
Hideous spraybombed one is the 3hp Larger size, OG paint is the standard 3hp size. (you will also need the shorter pickup tube installed on your carb if you just buy a tank for the smaller one)
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Note the shorter bracket assembly on the bottom compared to a standard 4-5hp (3hp wont have the throttle bellcrank parts on it or the U shape at the mounting ear)
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