im 25 and anything my grandpa needed mechanically i always did for him. i kept his 79 f150 460 running wich never really needed much. then 2 years before he passed away he gave it to me. sounds like he needs patients and respect. im in san antonio tx i would help you with it if you are close by. i love old cars way less bull crap to worry about. im sorry that sucks though, unless he is not mechanically inclined at all.
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1963 thunderbird 416 tri power c6 3.89
1979 f150 466 mostly stock' my grandpa's old truck
1992 lincoln t-car
2003 dodge ram 1500