97 chevy service truck bent pushrod

[Ezrider_92356]

i recently bought a service truck, got it cheap. chevy 350 runs rough seller claimed blown head gasket, said they had it looked at no compression on #6. i asked if one of the adjacent cyl's had no compression as well (ie head gasket blown threw the fire ring between two adjacent cyl's) they said they didn't believe so but didn't know if they might have just stopped with the compression test on #6 anyway the price was cheap enough i figured even with putting a new motor in it was still a good deal. trans shifts good 4wd works a/c even blows cold ect.

get it back to my shop and do my own compression test and find 0 compression on #6 all adjacent cyl's between 155-160 so i pull the valve cover and find a bent push rod on the #6 exhaust valve. the exhaust valve also seems to be stuck part way open (most likely bent)

so my question is what is the likely hood of piston damage? any opinions on course of repair ie rebuild the existing motor, used replacement, rebuilt crate engine. pull the head inspect the piston replace the valve and put it back together?

i don't intend to put many annual miles on this vehicle if that makes any difference

also the engine runs surprisingly well for only running on 7 of 8 cyl's other than a rough idle and low power.

any idea what might have caused this? iv rebiult a motor or two due to low compression burning oil ect, never had one do this before, other than one where a timing belt snapped and shoved a bunch of valves into pistons and punched holes in the pistons and caused all kinds of carnage, obviously not what happened here.