The quickest way to tell a 350 from a 400 is the location of the modulator...on the 400, it is at the
front, pass side, by the filler tube, pointing towards the outside of the car. On the 350, it is at the
rear, pass side, pointing to the rear of the car.
Another quick check is the governor cover attachment method. The 400 gov. cover has 4 bolts holding it on, and the 350 has just a round "cup".
hth
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Joel Adams
C3VR Lifetime Member #56
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"