Sounds like to me I should be fairly safe with replacing the head only, for now. I was planning on purchasing this head from amazon for $640 w/ full gasket kit:
https://www.amazon.com/gp/product/B07P7QPLCQ/ref=ox_sc_act_title_1?smid=AH13DMJHYILIY&psc=1
@Wolfamn - Just curious, is your L355 at...