Heavy,
I'm working on a 292 in a '29 boxed frame. Were you planning on cutting the firewall to make it fit? I went through all sorts of mock ups and ended up moving the front x-member a few inches forward t us a stock type fan and have the last exhaust ports in front of the cowl. I made my own m-mounts from a pic on the HAMB. Two plates held at 45 degrees by side plates. First pic shows engine setback so radiator/x-mem is in stock location.

This shows relocation of x-mem/radiator so exhaust clears firewall-some dimpling still reqired.
RB