When I made the movie of my car I remembered about my plate above my adapter plate... It is almost an inch tall and was wondering if that would be enought to hurt the low end? If I remember correctly tunnel rams are better for higher rpms... the reason I used the plate was because the bottom throttle mechanism piece was hittin the manifold and saw the spacer on my 289 and thought I would put it to use.... I dont know if I am stressing over nothing or if under an inch would actually do anytihng, Thanks, Tommy (it would be nothing to take it out and cut or bend the piece and modify the linkage....)