New Seacraft Owner with some questions

[datngrizz]

Hey folks - Gotta say this website is what prompted me to buy my project. I just got a 1980 20' Master Angler...I know very little about boats other than to run em. I found this one and it just grabbed me ($3500 with the motor---did I get robbed). I researched on this site and others and decided to buy it to fix up. A couple of questions:
-Where can I get new or refurbed nameplates, spec plates, SeaCraft decals etc? Mine are worn, broken or missing.
- This has a 150 Merc on it (1980 model I think). From other posts this sounds OK. TN is going (eventually) to no 2 strokes but will grandfather existing...should I look to keep this, go up to a 175 2 stroke before the law changes or go 4 stroke (what size)? What kind of cruising/top end can I expect from the 150?
- I have several soft spots around the deck (hull is solid). Can I cut around the gutter and lift the deck off in one piece to repair?

Again, I am a rookie at this. I live on Ft Loudon lake, have a pontoon, a CraigCat and a jet ski but couldn't resist adding this to my "Fleet." Thanks!