300/440/550 86 js300 hull 85 550 engine

whats up guys from az. i just picked up my first 2 skis. i got a js300 with a very clean hull and motor still runs. and i have a 85 550 and hull is really beat with cracks and chips. but the 550 is built. i only paid 600$ for the 2 skis. so im thinking of swaping the motors. will everything from the 550 bolt onto the 300? i read somthing bout the 300 only having 3 motor mounts.
 
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