Once you go above a 60 size 2 stroke glow nearly all of the engines are ringed and not ABC. Jett makes a 90 2 stroke AAC but large 2 stroke ABC types are often hard to start given their high compression relative to a ringed engine which is why most engines over 60 size are ringed which have less compression when cold.

The Irvine 72 is a well made engine that you won't regret buying.