Looking to get my heads rebuilt on my 306. I believe I have a bent push rod that is causing the value seal to leak a little. Is there a certin kit I need to buy to rebuild the head? Also if I have a mechanic do the work, what should I expect it to cost with parts and labor? I have Systemax heads ported and polished. It's a built 306 about 400hp. If you guys can help me figure this out. That would be awesome.