RE: Which engine to use?
In gas powered boats there are more Homelites than everything else together. Zenoah rules in performance boats. Quickdraw is a very good engine and very expensive. Speed costs, how much can you afford?
The engine you show is designed for Go-Peds and has a good clutch and power take off. The clutch is similar to Kioritz.
Homelite is not used in power units for a very good reason, the clutch. The Homelite clutch is simple, CHEAP, and borderline even for a weed whacker. The Homelite clutch is metal to metal and a clutch for power transmission uses friction lining.