headers,motor mounts and bigger front springs..

the valve seals aint nothing to be scared about either..worst comes to worst get some after market alum heads..u will gain power and save weight and engine temps will be cooler.do to the alum hea disapates heat faster.

now for the over heating problem..are u sure u dont have an air bubble in the system..it happens sometimes and can be a pain in the ass..also are u running an after market water pump..if the pump is to strong u will pump water threw the cooling system to fast for it really to cool the engine..i know it sounds weird but the water dont have enough time to suck the heat out the engine.