repowering my V20. need some advice

I concur with Mac, sounds like too much weight. Plenty of motors out there for under $10000 that you are thinking of spending. Guys on this board are always finding 150hp+ motors for under $5000. Look for a 175hp+ that's what I would recommend for skiing.

These V20 hulls are great and versatile. If you have the time and knowhow, you should consider restoring one that has been handed down to you from family an honor.
You will be happy and proud all said and done.