I have a header for $100 , so if you buy the weber 32/36 and the header plus had a 2 inch exhaust. $300 will give you a noticible gain. If you take the head off and clean up the ports , don't remove metal but just clean up casting marks , and add a set of standard A-14 valves and GX valve springs you probably can get 80-85 horsepower and the motor will rev safely to 7500 RPM's. You should be able to do a decent motor for $450. Add another $150-200 to put in a GX spec cam and balance the motor.

Topm Grossmann