Engine bogging after bodywork

sounds weird, but what happened is a straight on rear-ender with the 91 mighty max. didnt hurt the frame, or visually hurt the engine. Just had the fenders, hood, and front stuff replaced and repainted. It starts up fine, runs smooth, but when driven it seems to bog, and doesnt have the power that it did. So- what to check? I will look for blockage in the intake system, disconnected plugs to the sensors, re-check timing, ...
no drivetrain noises or damage, tranny and clutch seem normal

any other ideas??

we moved the distributor and it made it better- so it's definitely the timing belt. It must have slipped a tooth in the accident. Gonna spend 22 bucks on a belt.

changed the timing belt, it had slipped and 2 teeth were missing. The cam timing was retarded.