With any engine over 200K the smoking MAY not be via the valve seals.
Check your compression first, valve seals are LOTS of labor even if not paying I would only do it when very necessary.
M79 155K miles Jmod!! Rockin Stock tune Daily, Muscle Merc tune for track 14.85 @95.632004 Crown Vic LX
New Daily 2016 Dodge Charger R/T Road and track, purchase with 16K now 23K after 3 months. 5.7 Hemi, 8 speed ZF trans 3.06 open rear 13.98 @ 99.2 mph 4740 lbs with driver!!
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Project car 74 Chevy Laguna type S-3, # match 400 SBC
93 P-71 2001 P-73, 94 TC Exec, 96 TC Signature, 04 LX