Jody is right; the 307 frame mounts are wider and taller, and use a wider and thinner motor mount. All the other engines used narrower and shorter frame mounts with narrower and taller motor mounts. The taller engine mounts will absorb a little more vibration since they have more isolation material.
FYI, based on my measurements of factory pieces, the 307 frame pads and engine mounts will lower the engine in the car by about 3/16" compared to the 350/all other engine mounts. I run the 307 stuff myself, mostly because my car was originally a 307 car and I didn't feel like swapping the mounts on the frame. Added bonus that it lowers the engine a bit!
Troy
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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