I'm always wary of rebuilt engines from individuals. Just don't know what they did and if they did it correctly.
But a 351M is a strange case. Personally I'd not rebuild an engine as a 351. There just aren't pistons to give a 351M anything other than 8.0:1 compression. But slip a 400 crank in and there are lots of pistons available.
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI
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