Did they give you a breakdown on pistons/rings brand...etc.
Estimate sounds high. Has this guy rebuilt Pontiacs before? If not, I still recommend Ken in Brooksville. There is a difference between generic engine machinists and Pontiac only machinists.
My friend just got his 400 redone with new Ferrea valves, Scat rods and Diamond Pistons for $3,350 with new guides (not knurled) and a SERDI valve job...Sunnen torque plate bored. New COmp Cams Springs and Cam as well.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.