Checked it out today with the XE274H. Sounds like a mild muscle car. Not modern smooth... but not super lopey or radical. Didn't check manifold vacuum yet.
You hear the cam at 500rpm.
1968 Firebird 400 Convertible Original: Engine, Intake manifold, Heads, Body, Stereo, 3.08. THM400. Engine rebuilt by Ken Keefer early 2012. New: Holley 4bbl 670 HP, hidden iPod setup, RobbMC mini starter, A/C, front disc brakes
