you can put a stroker kit in it but your still down on cc's...the head should be the small combustion chamber so I would keep that have it professionally ported mod the alignment dowls and mount it on a predator 212...I just finished a motor like that with a billet rod and flywheel wisco piston dynocam and nrracing 1.3 roller rockers 26mm mikuni and it flys
I have a gx160 that has a black mamba Sr cam, a RTC-8 head off of a predator and a NR racing .670 bored carb. It has a billet rod and billet steel flywheel, ZH8 flattop piston. The valves are 27 IN and 25 EX. She is a screamer and gets there quick. The head is not milled for higher compression, but that would be my last mod. It is ton of fun. Depends on how much money you can throw at it. You can put the cam into a hemi predator if you do go to a larger motor later on.