aluminum cyl heads

The homework has been done......how much you want to enhance performance would be the next question.
Eddies will knock a good chunk of weight off the front end and give a slight gain.
Ported , they will provide a substantial gain.
Next up might be the Airwolf heads , but they are new and I haven't seen anyone use them yet......but everything I read shows promise.
Commando's ?
I think there is more bang for the buck out there , but the large port version is capable of making some steam with complimentary parts.
With quality rockers , you are staring at a couple G's if you buy new and buy right.....add another 800 for porting.
For three grand , with no other changes ...........check that........it will now want a bigger carb.
Good exhaust.
The cam would work , but it would really come to life with a little more stick.
But you could see around 40 - 50 h.p. with ported heads alone , and closer to 100 with matching intake , carb , cam and exhaust.