[RichardJ]

I made my own bracket so I am unable to comment on the Vintage Air bracket from experience.

I thought $160 was a bit much and I wanted to use an HEI. In the end I had to use a short cap HEI with external coil. I still have to loosen compressor and swing it up to remove HEI cap and #1 plug.

The external coil HEI dist has different indexing slot for the different cap.

Vintage Air says their bracket is for 250 so a 292 will give you an extra inch, for dist clearance.

Their bracket looks beefy enough you should be able to enlarge holes for better plug clearance.

To answer your question about "interfered with the rocker cover ", look at their installation instructions on their web page.
They include 1/4" spacers to space their bracket away from the head. You could use thicker spacers and longer bolts if needed.

I would weld the spacers directly to the bracket to avoid a major headache during installation.