Short note about the pics above.....guess I didnt explain much.
I had some good advice from a friend who uses these type blowers making 500 hp from 240 inch engines, on the street, on pump gas. He told me, "It is not possible to make the blower mount too strong, or too heavy." There will be a strong bracket arrangement for the rear, also (Shown temporarily bolted during fabrication).
Thats the reason for the 1/4" cold rolled steel plate, doubled, with back bracing. Any oscillation of the blower itself will loosen every bolt or shear brackets. This will use a Gates automatic tensioner and a "draw roller" to straighten the belt web coming off the blower pulley. This method slightly shortens belt life, but allows longer periods of highest boost operation.
The window in the mount plate is for the forward exhaust header. That took a while to cut on my converted vertical woodworking bandsaw (jackshafts and pulleys to get down to 43 RPM for 14" wheel). Slow cutting, but gives a man time to think.
JimL