^^^ I agree.
It sounds like someone has messed with the motor quite a bit, but if its a numbers matching block and heads, it will still be worth a lot because it can be reverted back. If someone really messed with the motor though (bored it, changed heads, etc) or replaced it with something other than JBP parts it probably hurt the value a lot. And verts are worth more, as are manual transmissions typically.
2011 Synergy Green Metallic 1SS Camaro:
RS Package, White Ralley Stripes, Premium Sound.
Mods; Flowmaster Exhaust, Vararam CAI, Pfadt Sport Suspension, Budnik "Ice" Wheels, Nitto Invo tires
Upcoming Mods; Custom grill and badging.