Is a Tecumseh or Briggs & Stratton Flat-Head 5HP Engine the best fit for my model mini bike?

#1
I have a 1971-1972 Steens Taco - Super Trail 100 (Model ST100) Mini Bike that needs a flat-head engine & I need help on what would fit best for it. Would a Tecumseh - HS50 5HP Flat-Head Engine or a Briggs & Stratton - 5HP Flat-Head Engine fit best in the frame? I do not know if there would be anuff room for the Briggs & Stratton 5HP Flat-Head Engine being the gas tank is located in the back & directly connected to the carburetor & the air-filter being mounted up high. I am pretty sure a Tecumseh - HS50 5HP Flat-Head Engine would fit fine being the Super Trail 100 originally came from the factory with a Tecumseh - HS40 4HP Flat-Head Engine. Let me hear some opinions on what would be best.
 
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