[bigshrimpin]

Chesapeake - I think the 150 Yamaha Carb is an excellent match the v20. It's bulletproof (proven) design not to mention that it's very good on fuel.
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Also I'm a big fan of the "old school" two stroke mercs (I have an 81 - V225 and a 87 - 150 XR2). The weak point on the older mercs was the oil injection.

If you are buying a used/rebuilt one. There are many flavors of Merc 150's. 150's were made with 2.0L, 2.4L, and 2.5L blocks. I like 2.0L v6 mercury 150 (2:1 gear ratio) for economy and the 2.5L block (non EFI) for power.
The 150 XR2/unmarked 150's are a 2.0L block
The 150 XR4 is a 2.4L block
The 150 XR6's/EFI's are a 2.5L block

All Merc 150's weigh less than 420lbs (except opti and verado)