well i will chime in here.
i have jims 12 port +4 stroker, yeah it cost some money but after some critical jetting i got it to make 82 hp with shearers.
check my results in my sig
i havent ridden a gorr port, i sure its good.
i will also say jims motor is a running beast.
my port job i can lug it around in the trails and then it has plenty of top end power. its not a full out dragger like some but its close, it does get beat, but its beyond fun.
i also know big blue had a dune port 350 from jim you can ask him about it also it made good power also. think it made 70 hp with shearers also.
you can pm big blue about his old motor, for other sources
so its your choice, just throwing some other info in.
wes