"The B&B was advertised at 1.7:1, which probably means the adjuster was moved toward the shaft by about 5/32" to 3/16". This is probably safe, although the pushrod clearance hole must be elongated."
My measurements on Barkers indicate that push rod moves a bit more then 5/32:
the difference from stock is pushing .16
I have set of them for my 216 build:
I also have a set of '39 lifters and push rods which I intend to use with them. The early style push rod was alot longer so the angle 'off center' will be smaller.
Since you intend to build custom rockers - why not go for a smaller diameter shaft? This would allow you to move the fulcrum closer to the push rods (keeping them straight) and thus increasing the ratio. It is more engineering - $ - and you would have to build exhaust rockers as well. With off center bushings you could use the stock perches . . .
