John,
Give me a call.. we now hove a boot cowl that should work fine on the Continental and Lycoming installs
While the older instructions call for riveting the boot cowling to the firewall.. we currently use a sealant and c'sink screws for mounting the boot. It works out well.... Accessing behind the panel is much easier without the boot installed so waiting until the last minute to install it can be helpful. Once installed access ins't too bad from under and over the glare shield... and if absolutley needed the boot can still be removed.