nice job. i did the same thing using lexus rx350 seats in my '81 c10. biggest challenge is to get them low enough with the crazy floor pan ups and downs. tilt wheel helps. comfortable seating is high on my list of priorities as well as yours.
i would look for a used squarebody plow truck with a good working plow and move the plow frame over to your truck. not a lot of work. dont forget to add timbrin overload bump stops to replace the stock ones. i have been doing exactly what you intend to do for 17 years with a used $300 meyer...
you should be just as aware of tire age as tread. with age they will lose wet weather traction and flexibility as the temperature drops no matter how good the tread looks. in my mind a 5 year old tire is too old.
if you are not adding zink additive to a flat tappet motor you are simply rolling the dice. is $8 gonna break the bank? i lost a cam for that very reason. not worth the gamble
i used LMC on 3 builds over a period of 14 years and never have i felt that the parts were not usable or inferior. patch panels, interior, and smalls. i either have incredible luck or low standards.
congratulations on owning a 400sbc! treat it like a big block (bigger than a 396) it needs to be properly cooled. use a bb rad and do not run it without a shroud. if rad and stat are up to snuff it should give you no problems. do not run it without a shroud. have been running these engines since...
i think you will have a hard time getting 350 ft/lb torque out of that combo. also what is the gear ratio? the right engine with the wrong gears will fall flat on it's face
there are some good videos on youtube pertaining to engine cleaning. i would look there before deciding on a course of action. no need for a teardown in my humble opinion
what's wrong with just timing it by ear and see how it works. bump it a little advance and see what happens, if no good retard it a little at a time. doesn't seem like this engine has a sweet spot. my guess is timing chain and camshaft. probably not been using a zinc additive. one more thing to...
a professionally built 400 sb with the right heads pistons cooling and cam would not fail and would provide the torque you need for towing. if you are mostly concerned about mileage, buy a late model truck