Looking for 2.7 or 3.2 engine up grade

[FHW]

My 1998 base boxster engine has been very reliable since I've reworked the heads but i'm a bit worried about the lower section. It has over 180 K on it at this time. If it goes I want to be prepared to swap it out for a larger engine. So I'm looking for a 2.7 or 3.2 engine to replace it when it goes to Kablooie. I'm willing to travel some distance for the engine. Any ideas will be appreciated.