To expand on this the factory manual states that if the head and/or block are out of specification they are to be REPLACED. NOT machined or surfaced.
This being said, 1FZ blocks have been decked and heads have been surfaced.
Do remember that removing material from the block deck or the head effectively makes the timing chain too long. I would suggest a custom aftermarket head gasket (from someone such as Cometic) that is thicker to compensate for the material that has been removed from the block/head.
Yes my cylinder head was surfaced even though I struggled with the decision... The recommended machine shop that did it insisted it should be done and claimed they had done "lots!" In prior years.....my mind didn't really believe them but my heart said "trust them ... They know more than I do!" ... In the final analysis they were able to clean gasket material and general corruption off the surface that I couldn't budge without resorting to heavy duty abrasives that probably would have done more harm. And I hope the chain tensioner takes up the little bit of slack this may have caused .. ... Life was a little easier with older pushrod engines. I often wish we just had the old ford 300inch 6cyl. Or better ... A Toyota clone complete with metal timing gears etc.
Anyway .... I am curious if my camshafts are still reasonably well aligned or if I can expect loud noises now out of the top end. ... My motor has 325++k km on it and the cylinder wall cross hatching was still very obvious. I remember how hard my father used to be on engines ....and they always rewarded him with long lives and high mileage....maybe we obsess to much and should just drive them.
We call it "come ticket me red!" Cruiser Dan