allways a bit of fun with aftermarket parts
Try fitting 3 x 2 barrel webers to a Redline manifold that has the centre carb mounting skewed to the left by 2 degrees. the manifold cost is $999 Australian dollars, you'd think they would get it right....
but no. all of them are like that for no good reason
Hence
A bolt with a smaller head..... that will do it ... :)
Dave