Go drive the car before you pass... If I blew up my motor and put in a crate LS1 then i'd probably baby it for a while. Let it idle for a half hour and listen to the motor. Try to feel if there is any slack in the driveline... The car may be awesome... 12 bolt will literially have 12 bolts on the rear cover... Also check to see if there is any evedience N2O system. The wear on the pedals will indicate how the car has been driven... Also, if the seat will flex a bit to the right then you know he was stomping on it hard...
I just re-read the description and there is little doubt that it has been driven hard... still would give it a test drive.
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98 Red SS M6 SLP# 1677 - SLP Headers & Exhaust - SLP Lid & Shifter - LS6 Intake - LS7 Clutch - Cam TR224 - 1.7 Crane Roller Rockers - Crane Pushrods - Comp 918 Springs - SLP Underdrive Pulley - FTRA - 4.11 10 Bolt - TA Cover - 315's |