Stumbling Slant --what is left??

90 lbs wont run for **** guys.

After reading all the post seeing something in there about it should have lasted longer Etc. Fact is it's not uncommon for the 225 to be done at or around 170- 200k. Many are toasted by a number of things, infrequent oil changes...tune... many kill the no.4 or 5 cyl due to the carburetor or intake having issue...like a lean mixture issue. I gave my brother 4 225 engines with 2 of them low miles rebuilds... he swapped his same carb/intake onto each....and all of them 'though the plugs looked ok' killed the no.4 exhaust valve...i mean burnt and 1/4 of the valves satellite missing...cooked..gone.
He ran around all over the place with 'electronic ignition' and no hard seats...on an lean tune that would run decent at 2800 or so ft elevation....3 on the tree buzzing in 2nd in LA traffic, san diego, shaver lake, china lake...they are a great motor but one that was designed 60+ years ago. I spec if you had it all right and used a manifold that was dialed and a nice 390 holley or 350 holley that metered better... it would last longer than my own that never burnt seats or had issue but were ridged and starting to vary on cyl pressure at the same 170-190k mileage. Slant 6 engines ,no matter what anyone says.. are engines you will have the head off at least once if not twice in its lifespan.. 2-3 carb go throughs in its lifespan....and if you rev it hard... 4-5 distributor gears....dont forget the 10 valve cover gaskets you end up putting on it.
Its toast....90lbs is for ****.... all the exhaust valves are probably sank...especially the problem cylinder. Slant 6's are so cheap to rebuild...it's like 1500 bucks and you time..If that.