Hi Pope,

The width of the firewall is 77mm. The length firewall to backplate is 115mm. I had to recess the carb into the firewall to obtain the proper distance so be sure to reinforce the firewall.
I used to worry about ca hinges with gasers but this doesn't seem to be an issue. The hinges on the Bendix are solid and are holding up fine. I also used micro metal gear servos to save weight with this install. Please let us know if the engine will work for you.

Carl