Looking for used 20' Seacraft - need advice

[Ogaff]

I currently have a 17 ft Boston Whaler Montauk, looking to upgrade to a 20' Seacraft. Issues with Whaler are it is a rough ride, even in normally calm Cape Cod bay, also powered by '88 Evirude which sucks gas. Looking at a mid seventies to mid eighties Seacraft CC with new power, perhaps 2-4 yr old engine. Need some guidance.

1) What do you get on Potter Build hull vs pre/post potter, is something that can be quantified (stronger hull design) or is it just a classic. What years are considered potter built?

2) I have owned whalers for a long time , comfortable with self bailing , "unsinkable" boats with low maintenance. I understand that the '70 20' Seacraft are not self bailing but, at some point mid '80s they did go self bailing, can anyone tell me what year this happened. The thought of relying on a bilg pump and battery in 4-5 foot seas for saftey is somewhat concerning.

3)I have heard various opinions on putting a 4 stroke on a 20' CC Seacraft, is it to heavy an engine, or performance wise are you better off going with 2 staroke?

4)Any opinions on buying a new 20' Key Largo vs used Sea craft, I have been told the Key Largo hull is the Sea Craft hull which the patent expired on and was picked up by Key Largo, any comments (fact/fiction)?