Currently have a '91 twin cam w/approx 109k miles on the motor. Motor overheated on previous owner. Head was yanked and resurfaced.

The car has a bit of an oil consumption issue. Under full throttle it burns a small bit of oil in the upper RPM range and sometimes a puff between shifts. I imagine this is a valve issue. Then again the car was run pretty hard with less than a quart of very old, thick oil...so I may have other issues going on in the bottom end.

Instead of going with an SR, I'm thinking about doing a little bit of cheap work to the KA and start autocrossing again. Curious what sorts of cam options I have out there. Also interested what sorts of gains, if any, the KA sees with minor head porting. Does anyone out there offer a ported head package?

Also, how much does an average complete head off a low mileage late model KA go for? Would I be better off just swapping the entire motor for a lower mileage/newer KA?

Appreciate the help.