I'd buy that motor for $400 and just rebuild it (take your time with it). However, you're on a budget so just save up and be patient. SR motor in Canada will cost you around $2500-3500 prices have gone up as they are hard to find now.
KA motor will last, if you take care of it! I had trouble blowing my KA motor and it had almost 200,000 km on it before i swap'd the motor. Just be patient, you'll be better of.
Steve.
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