I’d take it to a shop first man. Good chance all you need is some machine work and a top end tune up.
Or go load the parts cannon, whatever you want to do.
I don’t have hands on experience with a 1fz head in particular, but I have with other engines. In my opinion a rebuilt head from a quality automotive machine shop will come out with a higher build quality and tighter tolerances than a off the shelf factory replacement. And it will probably be...