@jncspyder At $10k for air cooled, Subaru was my first thought too. You can go with a used US or JDM engine that has 30k or so miles and just add the conversion pieces. A Subaru engine especially complements a Coupe where you need AC/heat and perhaps less engine noise.
Wonder what the 1700 cc engine is in the Coupe now? Is it a 1600 cc with 88 pistons/cylinders (1679 cc) or perhaps a stock T4 1.7L (same 1679 cc)? The T4 can fairly easily be build up. New P&C can boost to 2.4L plus the bottom end is strong.